Musnad Ahmad 937:53

Isma'il narrated to us, from Yunus, from al-Hasan, from Sa'sa'ah ibn Mu'awiyah, who said: I came to Abu Dharr and said: "What is your wealth?" He said: "My deeds are my wealth." I said: "Narrate to me." He said: "Yes, the Messenger of Allah (peace and blessings of Allah be upon him) said: 'There are no two Muslims whose three children die before reaching the age of puberty, except that Allah forgives them both.'" I said: "Narrate to me." He said: "Yes, the Messenger of Allah (peace and blessings of Allah be upon him) said: 'There is no Muslim who spends a pair of anything from his wealth in the way of Allah, except that the gatekeepers of Paradise will meet him, each of them calling him to what they have.'" I said: "And how is that?" He said: "If it is men, then two men; if it is camels, then two camels; and if it is cattle, then two cows."