Musnad Ahmad #1075

It was narrated that ‘Ali (رضي الله عنه) said: Khadeejah (رضي الله عنها) asked the Prophet (ﷺ) about two children of her who had died during the jahiliyyah. The Messenger of Allah (ﷺ) said: “They are in Hell.` When he saw that she was upset, he said: “If you saw where they are now, you would hate them.” She said: O Messenger of Allah (ﷺ), about my child from you? He said: `He is in Paradise.` Then the Messenger of Allah (ﷺ) said: `The believers and their children will be in Paradise and the mushrikeen and their children will be in Hell.” Then the Messenger of Allah (ﷺ) recited: “And those who believe and whose offspring follow them in Faith, - to them shall We join their offspring...” .