Sunan Ibn Majah, Volume 4, Book 25, Hadith 2894 (DarusSalam) ⓘ

It was narrated from Ibn ‘Umar (from ‘Umar) that he asked the Prophet for permission to perform ‘Umrah, and he gave him permission and said to him: “O younger brother, give us a share of your supplication, and do not forget us.”

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنْ سُفْيَانَ، عَنْ عَاصِمِ بْنِ عُبَيْدِ اللَّهِ، عَنْ سَالِمٍ، عَنِ ابْنِ عُمَرَ، عَنْ عُمَرَ، أَنَّهُ اسْتَأْذَنَ النَّبِيَّ ـ صلى الله عليه وسلم ـ فِي الْعُمْرَةِ فَأَذِنَ لَهُ وَقَالَ ‏ "‏ يَا أُخَىَّ أَشْرِكْنَا فِي شَىْءٍ مِنْ دُعَائِكَ وَلاَ تَنْسَنَا ‏" ‏ ‏.‏