When Mu'adh b. Jabal was on his deathbed he said, "Seek knowledge from four people, front `Uwaimir Abud Darda', from Salman, from Ibn Mas'ud, and from `Abdallah b. Salam who was a Jewish convert to Islam, for I heard God's messenger say he would be the tenth, to enter paradise."
Tirmidhi transmitted it.