Hadithcore
Sahih Muslim, 2714 b
sahih

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 Your name I place my side and if You 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 ‏

‏ ‏.‏

References2 variants
In-Book Reference
Book 48, Hadith 86
USC-MSA web (English) reference
Book 35, Hadith 6555 (deprecated numbering scheme)