Should kidney patients undergoing four-hour dialysis during the times of Dhuhr and Asr prayers pray during the procedure, or are they permitted to combine the two prayers with a delayed and shortened form due to extreme fatigue?

Prayer is the pillar of faith and the second pillar of Islam. Whoever neglects or abandons it deserves severe warnings, as Allah Almighty says: "So woe to those who pray, [But] who are heedless of their prayer" and "Then succeeded them successors who neglected prayers and pursued desires; so they are going to meet evil." Prayer must be performed on time, in congregation at the mosque, unless there is considerable hardship involved, in which case some scholars permit combining two prayers. However, shortening the four-unit prayer is not permissible except under specific conditions.