(23) باب بَيَانِ أَنَّ الدِّينَ النَّصِيحَةُ
It is narrated on the authority of Jarir that he observed I gave pledge of allegiance to the Messenger of Allah (may peace and blessings be upon him) on the observance of prayer, payment of Zakat, and sincerity and well-wishing for every Muslim.
Reference: Sahih Muslim 56 a
In-book reference: Book 1, Hadith 106
USC-MSA web (English) reference(deprecated numbering scheme): Book 1, Hadith 101