Sunan Abu Dawud
4400
Sahih+3

A similar tradition has also been transmitted by al-A’mash through a different chain of narrators. He also said :“... . Till he reaches puberty , and a lunatic till he is restored to consciousness.” ‘Umar then began to utter: Allah is most great

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid