It was narrated from Ayyub, from a Shailh of Qushair, from his paternal uncle; then we met him concerning some camels of his, and Bu Qilabah said to him: "Tell it to us." The old man said: "My paternal uncle told me that he went to the Prophet, concerning some camels of his, while he was eating. He said: 'Come and eat.' I said: 'I am fasting.' He said: 'Allah, the mighty and sublime, has waived half of the prayer and fasting for the traveler, the pregnant woman and the sick."'
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا مُحَمَّدُ بْنُ حَاتِمٍ، قَالَ حَدَّثَنَا حِبَّانُ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنِ ابْنِ عُيَيْنَةَ، عَنْ أَيُّوبَ، عَنْ شَيْخٍ، مِنْ قُشَيْرٍ عَنْ عَمِّهِ، حَدَّثَنَا ثُمَّ، أَلْفَيْنَاهُ فِي إِبِلٍ لَهُ فَقَالَ لَهُ أَبُو قِلاَبَةَ حَدِّثْهُ فَقَالَ الشَّيْخُ حَدَّثَنِي عَمِّي أَنَّهُ ذَهَبَ فِي إِبِلٍ لَهُ فَانْتَهَى إِلَى النَّبِيِّ صلى الله عليه وسلم وَهُوَ يَأْكُلُ أَوْ قَالَ يَطْعَمُ فَقَالَ " ادْنُ فَكُلْ أَوْ قَالَ " ادْنُ فَاطْعَمْ " . فَقُلْتُ إِنِّي صَائِمٌ . فَقَالَ " إِنَّ اللَّهَ عَزَّ وَجَلَّ وَضَعَ عَنِ الْمُسَافِرِ شَطْرَ الصَّلاَةِ وَالصِّيَامَ وَعَنِ الْحَامِلِ وَالْمُرْضِعِ " .
sunnah.com