Musnad Ahmad 31:410

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from Abu Bishr, from Abu Nadrah, from Abu Sa'id al-Khudri, from the Prophet, peace and blessings of Allah be upon him, that he said: "Whoever seeks chastity, Allah will make him chaste. Whoever seeks self-sufficiency, Allah will make him self-sufficient. And whoever asks us for something, and we find it, we give it to him."