H 374 Omar, the son of Khattab asked leave of the Prophet, praise and peace be upon him, to go on Umra (the lesser pilgrimage). The Prophet, praise and peace be upon him, gave him permission and said: 'Brother of mine, do not forget us in your supplications.' Omar commented: 'I would not exchange this (request) for the whole world.'" "The Prophet, praise and peace be upon him, said: 'Include us, my brother, in your supplications.'" R 374 Abu Daud and Tirmidhi with a chain up to Omar the son of Khattab who related this.
373- وعن عمر بن الخطاب رضي الله عنه ، قَالَ : اسْتَأذَنْتُ النَّبيَّ صلى الله عليه وآله وسلم في العُمْرَةِ ، فَأذِنَ لِي ، وَقالَ : "لاَ تَنْسَنا يَا أُخَيَّ مِنْ دُعَائِكَ" فَقَالَ كَلِمَةً مَا يَسُرُّنِي أنَّ لِي بِهَا الدُّنْيَا وفي رواية : وَقالَ : "أشْرِكْنَا يَا أُخَيَّ في دُعَائِكَ" . حديث صحيح رواه أَبُو داود والترمذي، وَقالَ: "حديث حسن صحيح" .