Muwatta Malik 608

When Abu Bakr was mentioned in `Umar's presence he wept and said, "I wish all my good deeds could compare with what he did on a certain day and a certain night. The night was the one on which he went with God's messenger to the cave and said when they reached it, `I swear by God that you will not…

عَن عمر ذُكِرَ عِنْدَهُ أَبُو بَكْرٍ فَبَكَى وَقَالَ: وَدِدْتُ أَنَّ عَمَلِي كُلَّهُ مِثْلُ عَمَلِهِ يَوْمًا وَاحِدًا مِنْ أَيَّامِهِ وَلَيْلَةً وَاحِدَةً مِنْ لَيَالِيهِ أَمَّا لَيْلَتُهُ فَلَيْلَةٌ سَارَ مَعَ رَسُولِ…