It is narrated from Sayyiduna Suraqah bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said to him: "Shall I not tell you about the charity with the greatest reward? Among the charities with the greatest reward is your daughter who has been returned to you, and who has no one to earn for her besides you."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6562