Narrated Bahz bin Hakim: "My father narrated to me from my grandfather, who said: 'I said: "O Messenger of Allah! Regarding our 'Awrah, what of it must we cover and what of it may we leave?" He said: "Protect your 'Awrah except from your wife or what your right hand possesses."' He said: "What about a man with another man?" He said: "If you are able to not let anyone see it, then do so." I said: "What about a man when he is alone?" He said: "Allah is most deserving of being shy from Him."

Another chain with a similar narration

Another chain of narration similar in meaning.

Narrated Bahz bin Hakim: from his father, from his grandfather, who said: "I said: 'O Prophet of Allah! Regarding our 'Awrah, what of it must we cover and what of it may we leave?' He said: 'Protect your 'Awrah except from your wife or what your right hand possesses.' He said: "I said: 'O Messenger of Allah! What about when some people are with others?' He said: 'If you are able to not let anyone see it then do not let them see it.'" He said: "I said: 'O Prophet of Allah! What about when one of us is alone?' He said: 'Allah is more deserving of being shy from Him than the people.'"

Narrated Abu Rimthah: "I saw the Messenger of Allah (ﷺ) wearing two green Burud."

Narrated 'Ali: that the Messenger of Allah (ﷺ) said: "There are six courtesies due from a Muslim to another Muslim: To give Salam to him when he meets him, to accept his invitation when he invites him, to reply to him when he sneezes, to visit him when he is ill, to follow his funeral when he dies, and to love for him what he loves for himself."

Narrated Abu Hurairah: that the Messenger of Allah (ﷺ) said: "There are six things due from the believer to another believer: Visiting him when he is ill, attending (his funeral) to him when he dies, accepting his invitation when he invites, giving him Salam when he meets him, replying to him when he sneezes, and wishing him well when he is absent and when he is present."

Narrated Hadrami, the freed slave of the family of Al-Jarud: from Nafi: "A man sneezed beside Ibn 'Umar and said: 'Al-Hamdulillah Was-Salamu 'Ala Rasulillah. (All praise is due to Allah, and peace upon the Messenger of Allah)'. So Ibn 'Umar said: 'I too say Al-Hamdulillah Was-Salamu 'Ala Rasulillah, but this is not what the Messenger of Allah (ﷺ) taught us. He taught us to say: "Al-Hamdulillah 'Ala Kulli Hal (All praise is due to Allah in every circumstance)."

Narrated Abu Musa: The Jews used to sneeze in the presence of the Prophet (ﷺ) hoping that he would say: 'Yarhamukumullah (May Allah have mercy upon you).' So he said: 'Yahdikumullahu Wa Yuslihu Balakum (May Allah guide you and rectify your affairs).'"

Narrated Salim bin 'Ubaid: that he was with some people on a journey, and a man among the people sneezed and he said: "As-Salamu Alaikum (peace be upon you)." So he (Salim) said: "'Alaika Wa 'Ala Ummik (upon you and upon your mother)." It seemed as if that bothered the man, so he said: "Indeed I have not said except what the Prophet (ﷺ) said; a man sneezed in the presence of the Prophet (ﷺ) and said: 'As-Salamu 'Alaikum (peace be upon you)' so the Prophet (ﷺ) said: ''Alaika Wa 'Ala Ummik (upon you and upon your mother). When one of you sneezes let him say: "Al-Hamdulillahi Rabbil-'Alamin (All praise is due to the Lord of all that exists)" and let the one responding to him say: Yarhamukallah (May Allah have mercy upon you)" and let him reply: Yaghfirullah Li Walakum (May Allah forgive me and you both)."

Narrated Abu Ayyub: that the Messenger of Allah (ﷺ) said: "When one of you sneezes let him say: 'Al-Hamdulillahi 'Ala Kulli Hal (All praise is due to Allah in every circumstance).' And let the one replying to him say: "Yarhamukallah (May Allah have mercy upon you).' And let him say to him: 'Yahdikumullah Wa Yuslihu Balakum (May Allah guide you and rectify your affairs).'"

(Another chain) with similar narration. He said: This is how Shu'bah reported this Hadith from IbnAbi Laila, and he said: "From Abu Ayyub from the Prophet (ﷺ)." Ibn Abi Laila was confused in this narration, sometimes he would say: "From Abu Ayyub from the Prophet (ﷺ)" and sometimes he would say: "From 'Ali from the Prophet (ﷺ)" similarly in meaning.

(Another chain) from 'Ali from the Prophet (ﷺ) with similar meaning.

Narrated Anas bin Malik: that two men sneezed in the presence of the Prophet (ﷺ); he responded to one of them and did not respond to the other. The one who was not responded to said: "O Messenger of Allah! You responded to this person and did not respond to me?' So the Messenger of Allah (ﷺ) said: "He praised Allah while you did not praise Him."

Narrated Iyas bin Salamah: from his father: "A man sneezed in the presence of the Messenger of Allah (ﷺ) while I was present, so the Messenger of Allah (ﷺ) said: 'Yarhamukallah (May Allah have mercy upon you).' Then he sneezed a second and third time. So the Messenger of Allah (ﷺ) said: "This man is suffering from a cold.'"

(Another chain) from Iyas bin Salamah from his father, from the Prophet (ﷺ) with similar narration, except that he said to him the third time: "You are suffering from a cold." And this is more correct than the narration of Ibn Al-Mubarak.

Shu'bah reported this Hadith from 'Ikrimah bin 'Ammar and it is similar to the narration of Yahya bin Sa'eed. (A chain to support that).

And 'Abdur-Rahman bin Mahdi reported it from 'Ikrimah bin 'Ammar and it is similar to the narration of Ibn Al-Mubarak, but he said to him the third time: "You are suffering from a cold." (A chain to support that)

Narrated 'Umar bin Ishaq bin Abi Talhah: from his mother, from her father, who said: "The Messenger of Allah (ﷺ) said: 'Reply three times to the sneezing person. If he (sneezes) more, then if you wish reply and if you do not then do not.'"

Narrated Abu Hurairah: that when the Prophet (ﷺ) would sneeze, he would cover his face with his hand or with his garment, and muffle the sound with it.