Sunnan Abu Dawud Collection: ::Book Number 10:: Hadith # 1807
Narrated Abdullah ibn Abbas: The Prophet (peace_be_upon_him) heard a man say: Labbayk (always ready to obey) on behalf of Shubrumah. He asked: Who is Shubrumah? He replied: A brother or relative of mine. He asked: Have you performed hajj on your own behalf? He said: No. He said: perform hajj on your own behalf, then perform it on behalf of Shubrumah.