Is the reward of one who prays on a chair the same as the reward of one who stands?

Question:
Honorable Shaykh, is the one on the chair considered as one who is standing, or as one who is sitting? This is a matter of the utmost importance. Is he considered as one who is standing, or as one who is sitting?

Answer:
Standing in the obligatory prayer is a pillar of the prayer, and it is not waived except for a valid excuse. As for the voluntary prayer, if his sitting is due to an excuse, he receives the same reward as the one who stands. If it is without an excuse, it is permissible for him to do so, and he receives half the reward of the one who stands.