Musnad Ahmad 442:1

Abu al-Mughirah narrated to us, Hariz narrated to us, he said: Shurahbil ibn Shuf'ah narrated to us, from some of the companions of the Prophet, may God bless him and grant him peace, that he heard the Prophet, may God bless him and grant him peace, saying: "It will be said to the children on the Day of Resurrection: 'Enter Paradise.'" He said: "They will say: 'O Lord, until our fathers and our mothers enter.'" He said: "Then they will come." He said: "God, the Mighty and Majestic, will say: 'What is the matter with me that I see them lingering? Enter Paradise.'" He said: "They will say: 'O Lord, our fathers.'" He said: "He will say: 'Enter Paradise, you and your fathers.'"