Al-Miqdam bin Ma'dikarib narrated that the Messenger of Allah (s.a.w) said: "When one of you loves his brother,then let him inform him of it."

Yazid bin Nu’ama Dhabbi says that the Messenger of Allah (peace and blessings of Allah be upon him) said:“When a person forms a bond of brotherhood with someone, he should ask his name, his father’s name, and his tribe’s name, because this increases love.” Imam Tirmidhi says:
1- This hadith is gharib; we know it only through this chain,
2- We do not know that Yazid bin Nu’ama actually heard from the Prophet (peace and blessings of Allah be upon him),
3- Ibn ‘Umar (may Allah be pleased with them both) also narrated a similar hadith from the Prophet (peace and blessings of Allah be upon him), but its chain is not authentic.