وَعَنْ عُمَرَ بْنِ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ
قَالَ اسْتَأْذَنْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي الْعُمْرَةِ فَأَذِنَ لِي وَقَالَ: «أَشْرِكْنَا يَا أُخَيُّ فِي دُعَائِكَ وَلَا تَنْسَنَا». فَقَالَ كَلِمَةً مَا يَسُرُّنِي أَنَّ لِيَ بِهَا الدُّنْيَا
I asked the Prophet’s permission to perform an ‘umra and he gave me permission, saying, ‘Include me in your supplication, little brother, and do not forget me.’ Then he said a word to me for which I would not be willing to take the world in exchange. Abu Dawud and Tirmidhi transmitted it, Tirmidhi’s version ending with ‘do not forget me.’’
Mishkat al-Masabih 2150, Book 10, Supplications, Hadith 24. 1 min read