Musnad Ahmed: Hadith 3577

Verily Allah looked into the hearts of His slaves and He found that the heart of Muhammad (ﷺ) was the best of the hearts of His slaves. So He chose him for Himself and sent him with His Message. Then he looked into the hearts of His slaves after Muhammad, and found the hearts of his Companions were the best of the hearts of His slaves. So he made them the helpers and advisors of His Prophet, to fight to support His religion. So whatever the Muslims think is good is good before Allah, and whatever the Muslims think is bad, is bad before Allah.