650
Sahih Isnaad+2
It was narrated that Al-Aswad said:"The final words of the Adhan of Bilal were: 'Allahu Akbar, Allahu Akbar, Allahu Akbar; La ilaha illallah (Allah is the Greatest, Allah is the Greatest, there is none worthy of worship except Allah)
Sahih IsnaadAbu Ghuddah
Sahih IsnaadAl-Albani