Is it permissible to supplicate in prostration during the obligatory prayer?

Supplicating (Du'a) is recommended during prostration in both obligatory and supererogatory prayers, due to the Messenger of Allah (peace be upon him) saying: "The closest a servant is to his Lord is while he is prostrating, so increase your supplication." He (peace be upon him) used to say in his prostration: "O Allah, forgive me all my sins, the small and the great, the first and the last, the apparent and the hidden." A Muslim may supplicate with whatever he desires from the good of this world and the Hereafter.