Is it necessary to bend the top of the foot when prostrating in prayer?

Bending the feet during prostration (sujud) is one of the Sunnah acts of prayer. It has been authentically reported that the Prophet, peace and blessings be upon him, used to face the Qiblah with the tips of his feet during prostration. This posture is not a condition or a pillar for the validity of the prayer. Rather, what is obligatory is to prostrate on the seven known limbs.