Musnad Ahmad 30:2030

Mu'awiyah ibn 'Amr narrated to us, he said: Za'idah narrated to us, from al-A'mash, from Abu Salih, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "Would one of you like, when he returns to his family, to find three large, fat, pregnant she-camels?" We said: "Yes." He said: "Then three verses that one recites in prayer are better for him than them."