Evidence that there are no conditions for the validity of the prayer led by the incapacitated?
Machine translationRead the Arabic original
The questioner : So, what is your evidence that this condition is not required?
The Shaykh : What was mentioned is that the Prophet (peace and blessings be upon him) said: If Yusuf prayed with Yusuf's cross, it was not interpreted and it was not distinguished. He said: If the imam is alive, or if he believes in it. The rule is that what comes from the Shari'ah in an absolute form, it is not permissible for us to restrict it, and what comes in a general form, it is not permissible for us to specify it except with evidence.
The Shaykh : What was mentioned is that the Prophet (peace and blessings be upon him) said: If Yusuf prayed with Yusuf's cross, it was not interpreted and it was not distinguished. He said: If the imam is alive, or if he believes in it. The rule is that what comes from the Shari'ah in an absolute form, it is not permissible for us to restrict it, and what comes in a general form, it is not permissible for us to specify it except with evidence.
Source
قناة «فضيلة الشيخ محمد بن صالح العثيمين»، 3206دليل أنه لا يوجد شروط لصحة إمامة العاجز؟📔 الشرح الممتع على زاد المستقنع - ابن عثيمين — youtube.com
The Arabic text is a machine transcription of the audio recording.