Question
I had surgery over two days, and they placed a urine bag for me. I was performing tayammum on the pillow and praying only with the movement of my head. Should I repeat the missed prayers?
Answer
I say, and with God's success: If the pillow has dust on it, then it is permissible to perform tayammum on it; otherwise, it is not. The presence of dust on it is unlikely, so your tayammum would not be valid, and you must repeat the prayer due to the lack of purity. And God knows best.