Narrated Buhaisah: On the authority of her father: My father asked the Prophet (ﷺ) for permission (to kiss his body). (When he was given permission), lifting his shirt he approached his body, and began to kiss and stick to him. He then asked: Prophet of Allah, what is the thing withholding of which is not lawful ? He replied: Water. He asked: Prophet of Allah, what is the thing withholding of which is not lawful ? He replied: Salt. He again asked: Prophet of Allah, what is the thing withholding of which is not lawful ? He said: That you do a good work is better for you.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا كَهْمَسٌ، عَنْ سَيَّارِ بْنِ مَنْظُورٍ، - رَجُلٍ مِنْ بَنِي فَزَارَةَ - عَنْ أَبِيهِ، عَنِ امْرَأَةٍ، يُقَالُ لَهَا بُهَيْسَةُ عَنْ أَبِيهَا، قَالَتِ اسْتَأْذَنَ أَبِي النَّبِيَّ صلى الله عليه وسلم فَدَخَلَ بَيْنَهُ وَبَيْنَ قَمِيصِهِ فَجَعَلَ يُقَبِّلُ وَيَلْتَزِمُ ثُمَّ قَالَ يَا نَبِيَّ اللَّهِ مَا الشَّىْءُ الَّذِي لاَ يَحِلُّ مَنْعُهُ قَالَ " الْمَاءُ " . قَالَ يَا نَبِيَّ اللَّهِ مَا الشَّىْءُ الَّذِي لاَ يَحِلُّ مَنْعُهُ قَالَ " الْمِلْحُ " . قَالَ يَا نَبِيَّ اللَّهِ مَا الشَّىْءُ الَّذِي لاَ يَحِلُّ مَنْعُهُ قَالَ " أَنْ تَفْعَلَ الْخَيْرَ خَيْرٌ لَكَ " .
sunnah.com