Narrated Ubayy ibn Ka'b:

: When the Messenger of Allah (ﷺ) prayed, he began with himself and said: May the mercy of Allah be upon us and upon Moses. If he had patience, he would have seen marvels from his Companion. But he said: "(Moses) said: If ever I ask you about anything after this, keep me not in they company: then wouldst you have received (full) excuse from my side". Hamzah lengthened it.

حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى، أَخْبَرَنَا عِيسَى، عَنْ حَمْزَةَ الزَّيَّاتِ، عَنْ أَبِي إِسْحَاقَ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ، عَنْ أُبَىِّ بْنِ كَعْبٍ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم إِذَا دَعَا بَدَأَ بِنَفْسِهِ وَقَالَ ‏

‏ رَحْمَةُ اللَّهِ عَلَيْنَا وَعَلَى مُوسَى لَوْ صَبَرَ لَرَأَى مِنْ صَاحِبِهِ الْعَجَبَ وَلَكِنَّهُ قَالَ ‏{‏ إِنْ سَأَلْتُكَ عَنْ شَىْءٍ بَعْدَهَا فَلاَ تُصَاحِبْنِي قَدْ بَلَغْتَ مِنْ لَدُنِي ‏}‏ ‏

‏ ‏.‏ طَوَّلَهَا حَمْزَةُ ‏.‏