Al-Bara' reported:

When Allah's Messenger (ﷺ) went forth from Mecca to Medina, Suraqa b. Malik b. Ju'shum pursued him. Allah's Messenger (ﷺ) invoked curse upon him, and his horse sank (in the desert). He (Suraqa) said: (Allah's Messenger (ﷺ) ), invoke blessings for me and I will do no harm to you. He (the Prophet) then supplicated Allah. (At that time) he (the Prophet) felt thirsty, and they happened to pass by a shepherd. Abu Bakr Siddiq said: I took hold of a bowl and milked some milk into it for Allah's Messenger (ﷺ) and gave it to him. He drank it and I was pleased.

حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ - وَاللَّفْظُ لاِبْنِ الْمُثَنَّى - قَالاَ حَدَّثَنَا مُحَمَّدُ، بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ، قَالَ سَمِعْتُ أَبَا إِسْحَاقَ الْهَمْدَانِيَّ، يَقُولُ سَمِعْتُ الْبَرَاءَ، يَقُولُ لَمَّا أَقْبَلَ رَسُولُ اللَّهِ صلى الله عليه وسلم مِنْ مَكَّةَ إِلَى الْمَدِينَةِ فَأَتْبَعَهُ سُرَاقَةُ بْنُ مَالِكِ بْنِ جُعْشُمٍ - قَالَ - فَدَعَا عَلَيْهِ رَسُولُ اللَّهِ صلى الله عليه وسلم فَسَاخَتْ فَرَسُهُ فَقَالَ ادْعُ اللَّهَ لِي وَلاَ أَضُرُّكَ ‏.‏ قَالَ فَدَعَا اللَّهَ - قَالَ - فَعَطِشَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَمَرُّوا بِرَاعِي غَنَمٍ ‏.‏ قَالَ أَبُو بَكْرٍ الصِّدِّيقُ فَأَخَذْتُ قَدَحًا فَحَلَبْتُ فِيهِ لِرَسُولِ اللَّهِ صلى الله عليه وسلم كُثْبَةً مِنْ لَبَنٍ فَأَتَيْتُهُ بِهِ فَشَرِبَ حَتَّى رَضِيتُ ‏.‏