The ruling on praying over a funeral while sitting?

Question:
He says: Honorable Shaykh, may Allah grant you success, is it permissible to sit in all voluntary prayers, such as the prayer for a deceased person, the prayer for rain, and the eclipse prayer? Is it permissible to sit in all voluntary prayers? How does one sit? For example, a sick person who does not want to stand up to pray over a deceased person while sitting; there is no harm in praying over a deceased person while sitting. He asks: Do I get half the reward if I am able to stand?

Answer:
No, it is not permissible to sit; standing is a pillar, and it is not permissible to sit except for a sick person who is unable to stand. This is like the obligatory prayer; standing is a pillar.