Qiyām- Second Episode
We said that qiyām is one of the obligatory parts of prayer. One of the obligatory acts when standing for qiyām is keeping the body at rest. Therefore, if the body starts moving while reciting takbiratul ihrām or during the qiyām connected to rukū', regardless of whether it is done intentionally or inadvertently, one must complete the prayer and perform it again.
But if one stands for qiyām to recite Surah al-Fatiha and the other surah or Tasbihāt, and inadvertently move their body or legs or bend, their prayer is not invalidated.
However, in such a case, the obligatory precaution demands that one recite the dhikr he has already recited in motion one more time once the body stands still.
The same ruling applies when someone collides with an individual who is performing prayer and causes their body to move, meaning as an obligatory precaution they must repeat the dhikr they have already recited in motion once their boy stands still.
The rest of the rulings pertaining to qiyām will be explained in the next episode.