He prayed, then it became clear to him that water had not reached part of the limbs required for ablution

Question:
Please, Khumays from al-Baha. Khumays. Yes, yes, go ahead, my brother. I wanted to speak to the Shaykh because today I prayed 'Asr. Yes, peace be upon you. The prayer came, and half of my knee did not get wet. I dreamed that we had a cold. We do not know, I mean, do I repeat the prayer, the ablution, and the prayer? What did you find? Excuse me, Khumays, Khumays, Khumays, repeat the question slowly, please, and raise your voice. My brother, today I prayed 'Asr. So if I prayed and most of the prayer reached only to half of my knee, and it did not get wet with water, I do not know whether I should repeat the ablution and the prayer, or is it sufficient?

Answer:
You must repeat the ablution and repeat the prayer; because your first prayer was not valid; because you did not perform the ablution properly, yes.