Musnad Ahmad 4051

lt was narrated from Abu 'Ubaidah bin ‘Abdullah that his father said: The Messenger of Allah (ﷺ) said: "Whoever sends ahead three (of his children) who did not reach puberty, they will be a strong protection against the Fire for him." Abud-Darda’ said: I have sent two ahead. He said: "And two." Ubayy bin Ka'b Abul-Mundhir, the leader of the prominent Qur'an reciters, said: I sent one ahead. He said: "And one, but that (i.e., the reward) is only (for showing patience) when calamity first strikes.”