Musnad Ahmad 353:1

Mu'ammal ibn Isma'il Abu 'Abd al-Rahman narrated to us, he said: Hammad narrated to us, he said: 'Abd al-Malik ibn 'Umayr narrated to us, from Munib, from his uncle, who said: It reached a man from the companions of the Prophet, may Allah bless him and grant him peace, that he was narrating from the Prophet, may Allah bless him and grant him peace, that he said: "Whoever conceals his Muslim brother in the world, Allah will conceal him on the Day of Resurrection." So he traveled to him while he was in Egypt and asked him about the hadith. He said: "Yes, I heard the Messenger of Allah, may Allah bless him and grant him peace, saying: 'Whoever conceals his Muslim brother in the world, Allah will conceal him on the Day of Resurrection.'" He said: "And I have also heard it from the Messenger of Allah, may Allah bless him and grant him peace."