Sahih Muslim 2714 b
This hadith has been narrated on the authority of Ubaidullah b. Umar with the same chain of transmitters and he said:
Then utter:" My Lord. with Thine name I place my side and if Thou keepest me alive have mercy upon myself"
وَحَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا عَبْدَةُ، عَنْ عُبَيْدِ اللَّهِ بْنِ عُمَرَ، بِهَذَا الإِسْنَادِ وَقَالَ ‏
"‏
 ثُمَّ لْيَقُلْ بِاسْمِكَ رَبِّي وَضَعْتُ جَنْبِي فَإِنْ أَحْيَيْتَ نَفْسِي فَارْحَمْهَا ‏"‏ ‏.‏