The ruling on touching the private parts in forgetfulness

The questioner:
Well, may Allah reward you, O Shaykh. Regarding touching the private parts in forgetfulness, O Shaykh, does it invalidate the wudu'?

The Shaykh:
Yes, if it is touching the flesh, the flesh, yes.

The questioner:
Even if it is in forgetfulness, O Shaykh? And what is the evidence, O Shaykh?

The Shaykh:
When he asked about the cave and performed wudu', this is the hadith.

The questioner:
Well, the saying of the Prophet (peace and blessings be upon him): "I have been granted pardon for my ummah for mistakes and forgetfulness," O Shaykh.

The Shaykh:
Yes, this is not a sin, not a sin, this is not a sin.

The questioner:
May Allah reward you. Well, regarding touching the two private parts, O Shaykh, touching the two private parts, touching the two private parts.

The Shaykh:
No, it does not harm, it does not harm.