Ibn Ka'b bin Malik (may Allah have mercy on him) narrates: When the time of death came to Sayyiduna Ka'b (may Allah be pleased with him), Umm Mubashshir (may Allah be pleased with her) said to him: Convey my greetings of peace to my son, meaning (her son) Mubashshir. Ka'b (may Allah be pleased with him) said: May Allah forgive you, O Umm Mubashshir! Have you not heard what the Messenger of Allah (peace and blessings be upon him) said? He said: "The soul of the believer is in the form of a bird that hangs in the trees of Paradise, until Allah returns it to its body on the Day of Resurrection." She said: I seek Allah's forgiveness.
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16169