(2) باب قَوْلِ النَّبِيِّ صلى الله عليه وسلم {وَايْمُ اللَّهِ}
Narrated Ibn `Umar:
Allah's Messenger (ﷺ) sent an army detachment and made Usama bin Zaid its commander. Some people criticized (spoke badly of) Usama's leadership. So Allah's Messenger (ﷺ) got up saying, "If you people are criticizing Usama's leadership, you have already criticized the leadership of his father before. But Waaimullah (i.e., By Allah), he (i.e. Zaid) deserved the leadership, and he was one of the most beloved persons to me; and now this (his son Usama) is one of the dearest persons to me after him." (See Hadith No. 765, Vol. 5)
Reference: Sahih al-Bukhari 6627
In-book reference: Book 83, Hadith 7
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 78, Hadith 623