Does a man's prayer become invalid if he does not place a barrier and someone passes in front of him?

The questioner : Here, at this point, I mean, if a person does not place a barrier and intentionally omits taking a barrier, can we tell him that his prayer is invalid and he must repeat it?

The Shaykh : Even if no one passed in front of him?

The questioner : Yes, even if no one passed.

The Shaykh : No, but he is sinful.

The questioner : He is sinful, but if one of the people mentioned in the hadith passed.

The Shaykh : If one of these three passed between the place of his prostration and his standing, his prayer is invalid.

The questioner : Do you know of anyone who held this view regarding the invalidity of the prayer of one who passes?

The Shaykh : Of course, Imam Ahmad.

The questioner : He held that the prayer is invalid.

The Shaykh: Yes.

The questioner : Other than the three, I mean if he did not place a barrier.

The Shaykh: No.

The questioner: No.

The Shaykh : I mean, what do you mean by "passerby"?

The questioner : Any passerby.

The Shaykh : If anyone passes, his prayer is invalid.

The questioner : No, due to the absence of a barrier.
The student : My Shaykh, I mean.

The Shaykh : Just relax now.

The questioner : A man, I mean, prayed and did not take a barrier, whether one of the three passed in front of him or no one passed, his prayer is invalid.

The Shaykh : No one said that.

The questioner : Is there any scholar who said this?

The Shaykh : We do not know of this.
The student : ... .

The Shaykh : We do not know of this. Yes, please proceed.