Muwatta Imam Malik Book of Shortening the Prayer, Hadith 71

Yahya related to me from Malik that Abdullah ibn Dinar said, "I saw Abdullah ibn Umar stop by the grave of the Prophet ﷺ and ask for blessings on the Prophet ﷺ and on Abu Bakr and Umar."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، قَالَ رَأَيْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ يَقِفُ عَلَى قَبْرِ النَّبِيِّ ﷺ فَيُصَلِّي عَلَى النَّبِيِّ ﷺ وَعَلَى أَبِي بَكْرٍ وَعُمَرَ .