Musnad Abu Ya'la al-Mawsili 117:140

Ibrahim ibn al-Hajjaj narrated to us, Hammad narrated to us, from Thabit and Humayd, from Anas: That the Messenger of Allah (ﷺ) arrived in Medina, and Abdullah ibn Salam was among his palm trees. When he heard of him, he came and said: "I am going to ask you about things that no one knows except a prophet. If you inform me of them, then you are the Messenger of Allah." He asked him about the resemblance (of a child to parents), about the first thing that will gather the people, and about the first thing the people of Paradise will eat. The Messenger of Allah (ﷺ) said: "Gabriel has just informed me of them." He (Abdullah) said: "That is the enemy of the Jews." The Messenger of Allah (ﷺ) said: "As for the resemblance, if the man’s fluid precedes the woman’s fluid, the resemblance goes to him, and if the woman’s fluid precedes the man’s fluid, the resemblance goes to her. As for the first thing that will gather the people, it is a fire that will come from the direction of the east and gather the people toward the west. As for the first thing the people of Paradise will eat, it is the caudate lobe of a whale’s liver." So Abdullah ibn Salam believed. He said: "O Messenger of Allah, the Jews are a people of slander. If they hear of my Islam, they will slander me and attack me. So hide me and send for them, then ask them about me." He sent for them, and they came, and he hid him. He (the Prophet) said: "What kind of man is Abdullah ibn Salam among you?" They said: "He is the best of us and the son of the best of us, our master and the son of our master, our scholar and the son of our scholar." He said: "Do you see, if he were to believe, would you believe?" They said: "May Allah protect him from that!" He said: "Come out, O Ibn Salam, to them." So he came out and said: "I bear witness that there is no god but Allah and that Muhammad is the Messenger of Allah." They said: "Rather, he is the worst of us and the son of the worst of us, the most ignorant of us and the son of the most ignorant of us." He (Abdullah) said: "Did I not tell you, O Messenger of Allah, that they are a people of slander?"