Musnad Ahmad 937:164

'Abd al-Razzaq and Yazid narrated to us, they said: Hisham narrated to us, from al-Hasan, Sa'sa'ah narrated to me—Yazid said: Ibn Mu'awiyah—that he met Abu Dharr while he was leading a camel of his, and around his neck was a water skin. I said to him: "Will you not narrate to me a hadith you heard from the Messenger of Allah, may Allah bless him and grant him peace?" He said: "Yes. I heard the Messenger of Allah, may Allah bless him and grant him peace, say: 'There are no two Muslims whose three children die before reaching the age of puberty, except that Allah will enter them into Paradise by the grace of His mercy toward them.'" "And there is no Muslim who spends a pair of his wealth in the way of Allah, except that the gatekeepers of Paradise will hasten toward him." And Yazid said: "Except that Allah will enter them into Paradise by the grace of His mercy toward them."