Nafi' narrated that Ibn ‘Umar said:
“The Messenger of Allah (s.a.w) ascended the Minbar and called out with a raised voice: ’O you who accepted Islam with his tongue, while faith has not reached his heart! Do not harm the Muslims, nor revile them, nor spy on them to expose their secrets. For indeed whoever tries to expose his Muslims brother’s secrets, Allah exposes his secrets wide open, even if he were in the depth of his house.’” He (Nafl’) said: ‘ One day Ibn ‘Umar looked at the House- or – the Ka’bah and said: ‘What is it that is more honored than you, and whose honor is more sacred than yours! And the believer’s honor is more sacred to Allah than yours.’”