What should the position of the feet be like in prayer (while standing, sitting and prostration)?

They say the big toe of the right foot must not be lifted at all during prayer; however, my feet are relaxed; when I sit, they are parallel to the ground. Are all of my prayers I have performed up to now invalid?

Dear Brother / Sister,

While standing (qiyam) the feet are parallel to each other and there is a gap of about four fingers between them; the tips of the toes face the qiblah.

If a person lifts his feet in prostration and keeps them in the air, his prayer is not permissible. If he lifts one foot and keeps the other on the floor/ground, it is makruh but permissible. However, if he cannot keep his feet on the ground due to an excuse, it is not makruh.

What is meant by putting the feet on the ground is keeping the toes on the ground. Then, if only one toe touches the ground, it is enough.

It is fard to prostrate in a prayer. Therefore, if prostration is not performed, the health of the prayer is prevented. The best form of prostration is to put two hands, two knees, two feet and the forehead with the nasal bone as a whole on the ground. 

According to Hanafis, it is fard to put two feet on the ground in prostration. Fard is fulfilled if one toe touches the ground. If a person does not put both of his feet on the ground, his prostration is not valid. His prayer is also invalidated since sajdah, which is fard, is abandoned. It is the same for both women and men.

In tashahhud, a person sits on his left foot, and his right foot is kept upright; and the tips of the toes face the qiblah.

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