Isa bin Yonus bin Abi Ishaq عيسى بن يونس بن أبي إسحاق · The Book on Salat (Prayer)

the Prophet said: "When one of you bows then says while he is bowing: (Subhana Rabbiyal Azim) 'Glorious is my Lord the Magnificent' three times, then he has completed his bowing. And that is the least of it. And when he prostrates and says while prostrating: (Subhana Rabbiyal A'la) 'Glorious is my Lord the Most High' three times, then he has completed his prostrations, and that is the least of it.'"

"The Prophet performed Salat on a Hasir."

"I asked Allah's Messenger (S) about the Salat for a man who is sitting. He said: 'Whoever performs Salat while standing then that is more virtuous. And whoever performs Salat while sitting, then he gets half the rewards of the one standing, and whoever performs Salat while lying down, then he gets half the rewards of the one sitting.'"