That worship must conform to the examples in its manner.

The Shaykh : And the manner
If a person performs the worship in its type, amount, and cause, but contradicts the Shari'ah in its manner.
An example of this is: a man who has a minor ritual impurity and performs ablution.
Is the state of impurity a cause for ablution or not?
It is a legal cause established by the Shari'ah, answer me, may Allah bless you?
The students: Yes.

The Shaykh : The state of impurity is a legal cause for the obligation of ablution when praying, and it is established by the Shari'ah.
The man performed ablution, but he washed his feet, then wiped his head, then washed his hands, then washed his face.
He performed the four obligatory acts of ablution, so is his ablution valid?
The students: No.

The Shaykh : Why?
He contradicted the Shari'ah in the manner.
Now, if a man is praying, and when he finished the recitation he prostrated, then stood up and bowed, is his prayer valid?
The students: No.

The Shaykh : Why?
He contradicted the Shari'ah in the manner.
Now, if he did this by mistake? He prostrated, then remembered, stood up, then bowed, is it valid?
His prayer is valid, but he must perform the prostration for forgetfulness.
Very well.