God does not Accept a Prayer in Contradiction to His own Promise or Custom

At another instance He states:

“Allāh the Exalted never acts in contradiction to His own promise1...Never thou wilt find a change in the way of God.”2

Then, in a Ḥadīth, the Holy Prophet(sa) states:

“Prayer is to worship as marrow is to the bone, which is as if the essence of the bone.”3

Hence, worship which does not contain the element of prayer is nothing more than a dead corpse.