Musnad Ahmad 937:70

'Abd al-Malik ibn 'Amr narrated to us, Qurrah narrated to us, from al-Hasan, from Sa'sa'ah ibn Mu'awiyah, who said: I met Abu Dharr at al-Rabadhah. He said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "Whoever spends a pair of his wealth in the way of Allah, the gatekeepers of Paradise will hasten to him." And he said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "There are no two Muslims who have three children die before they reach the age of puberty, except that Allah will admit them into Paradise by the grace of His mercy toward them."