It is narrated from Hazrat Umm Salamah (may Allah be pleased with her) that once the Prophet (peace and blessings be upon him) said, "Some of my companions will be such that after our separation, they will never see me again." Hazrat Umar himself quickly went to Hazrat Umm Salamah and entered the house and said, "Swear by Allah and tell me, am I also among them?" She replied, "No, but after you, I cannot say this about anyone else."