Sahih Muslim Book - 32, Hadith - 4692

حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى وَابْنُ بَشَّارٍ - وَاللَّفْظُ لاِبْنِ الْمُثَنَّى - قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ حَدَّثَنَا شُعْبَةُ عَنْ أَبِى إِسْحَاقَ أَنَّ عَبْدَ اللَّهِ بْنَ يَزِيدَ خَرَجَ يَسْتَسْقِى بِالنَّاسِ فَصَلَّى رَكْعَتَيْنِ ثُمَّ اسْتَسْقَى قَالَ فَلَقِيتُ يَوْمَئِذٍ زَيْدَ بْنَ أَرْقَمَ - وَقَالَ - لَيْسَ بَيْنِى وَبَيْنَهُ غَيْرُ رَجُلٍ أَوْ بَيْنِى وَبَيْنَهُ رَجُلٌ - قَالَ - فَقُلْتُ لَهُ كَمْ غَزَا رَسُولُ اللَّهِ -صلى الله عليه وسلم- قَالَ تِسْعَ عَشْرَةَ فَقُلْتُ كَمْ غَزَوْتَ أَنْتَ مَعَهُ قَالَ سَبْعَ عَشْرَةَ غَزْوَةً - قَالَ - فَقُلْتُ فَمَا أَوَّلُ غَزْوَةٍ غَزَاهَا قَالَ ذَاتُ الْعُسَيْرِ أَوِ الْعُشَيْرِ.

It was narrated from Abu Ishaq that 'Abdullah bin Yazid went out to lead the people in prayers for rain. He prayed two Rak'ah then he prayed for rain. He said: "On that day I met Zaid bin Arqam, and there was only one man between me and him. I said to him: 'How many campaigns did the Messenger of Allah (s.a.w) wage?' He said: 'Nineteen.' I said: 'On how many campaigns were you with him?' He said: 'Seventeen.' I said: 'What was the first campaign he waged?' He said: 'Dhat Al-'Usair' or 'Al' Ushair.'"