Abu Bakr and Umar, who were around him said, "Are we not your brothers? We believe in you and we migrated with you."
Prophet Muhammad (p.b.u.h) replied, "You are my companions. You accepted Islam and migrated with me but "Alas I wish I could meet my brothers...!"
Again they asked the same question, Prophet Muhammad (p.b.u.h) replied the same answer. Then they asked "O, Prophet who are those people?"
Prophet Muhammad (p.b.u.h) replied, "My brothers are those who are during the Akhir uz Zaman (end of time). They will believe in me although they have not seen me."
This shows a glimpse of our Prophet Muhammad's (p.b.u.h) love for us.