وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، كَانَ يَقُولُ اللَّهُمَّ لاَ تَجْعَلْ قَتْلِي بِيَدِ رَجُلٍ صَلَّى لَكَ سَجْدَةً وَاحِدَةً يُحَاجُّنِي بِهَا عِنْدَكَ يَوْمَ الْقِيَامَةِ ‏.‏

Yahya related to me from Malik from Zayd ibn Aslam that Umar ibnal-Khattab used to say, "O Allah! Do not let me be slain by the handof a man who has prayed a single prostration to You with which he willdispute with me before You on the Day of Rising!" Translation Not Available

Book Ref: Muwatta Imam Malik Book 21 Hadith 991
Web Ref:  Muwatta Imam Malik Book 21 Hadith 30