The Book of Faith ( Sahih Muslim No. 138)

 حَدَّثَنَا أَبُو بَكْرِ بْنُ النَّضْرِ بْنِ أَبِي النَّضْرِ، قَالَ: حَدَّثَنِي أَبُو النَّضْرِ هَاشِمُ بْنُ الْقَاسِمِ، حَدَّثَنَا عُبَيْدُ اللهِ الْأَشْجَعِيُّ، عَنْ مَالِكِ بْنِ مِغْوَلٍ، عَنْ طَلْحَةَ بْنِ مُصَرِّفٍ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ: كُنَّا مَعَ النَّبِيِّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ فِي مَسِيرٍ، قَالَ: فَنَفِدَتْ أَزْوَادُ الْقَوْمِ، قَالَ: حَتَّى هَمَّ بِنَحْرِ بَعْضِ حَمَائِلِهِمْ، قَالَ: فَقَالَ عُمَرُ: يَا رَسُولَ اللهِ، لَوْ جَمَعْتَ مَا بَقِيَ مِنْ أَزْوَادِ الْقَوْمِ، فَدَعَوْتَ اللهَ عَلَيْهَا، قَالَ: فَفَعَلَ، قَالَ: فَجَاءَ ذُو الْبُرِّ بِبُرِّهِ، وَذُو التَّمْرِ بِتَمْرِهِ، قَالَ: وَقَالَ مُجَاهِدٌ: وَذُو النَّوَاةِ بِنَوَاهُ، قُلْتُ: وَمَا كَانُوا يَصْنَعُونَ بِالنَّوَى؟ قَالَ: كَانُوا يَمُصُّونَهُ وَيَشْرَبُونَ عَلَيْهِ الْمَاءَ، قَالَ: فَدَعَا عَلَيْهَا قَالَ حَتَّى مَلَأَ الْقَوْمُ أَزْوِدَتَهُمْ، قَالَ: فَقَالَ عِنْدَ ذَلِكَ: «أَشْهَدُ أَنْ لَا إِلَهَ إِلَّا اللهُ، وَأَنِّي رَسُولُ اللهِ، لَا يَلْقَى اللهَ بِهِمَا عَبْدٌ غَيْرَ شَاكٍّ فِيهِمَا، إِلَّا دَخَلَ الْجَنَّةَ»

 It is narrated on the authority of Abu Huraira:

We were accompanying the Apostle ( ‌صلی ‌اللہ ‌علیہ ‌وسلم ‌ ) in a march (towards Tabuk). He (the narrator) said: The provisions with the people were almost depleted. He (the narrator) said: (And the situation became so critical) that they (the men of the army) decided to slaughter some of their camels. He (the narrator) said: Upon this Umar said: Messenger of Allah, I wish that you should pool together what has been left out of the provisions with the people and then invoke (the blessings of) Allah upon it. He (the narrator) said: He (the Holy Prophet) did it accordingly. He (the narrator) said: The one who had wheat in his possession came there with wheat. He who had dates with him came there with dates. And Mujahid said: He who possessed stones of dates came there with stones. I (the narrator) said: What did they do with the date-stones. They said: They (the people) sucked them and then drank water over them. He (the narrator said): He (the Holy Prophet) invoked the blessings (of Allah) upon them (provisions). He (the narrator) said: (And there was such a miraculous increase in the stocks) that the people replenished their provisions fully. He (the narrator) said: At that time he (the Holy Prophet) said: I bear testimony to the fact that there is no god but Allah, and I am His messenger. The bondsman who would meet Allah without entertaining any doubt about these (two fundamentals) would enter heaven.