Hadith on Speech: All his body parts defer to his tongue

Abu Sa’id al-Khudri reported: The Prophet, peace and blessings be upon him, said, “When the son of Adam wakes up in the morning, all of his limbs defer to the tongue and they say: Fear Allah regarding us, for we are only a part of you. If you are upright, we are upright. If you are crooked, we are crooked.

Source: Sunan al-Tirmidhī 2407

Grade: Sahih (authentic) according to Al-Suyuti

عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ إِذَا أَصْبَحَ ابْنُ آدَمَ فَإِنَّ الْأَعْضَاءَ كُلَّهَا تُكَفِّرُ اللِّسَانَ فَتَقُولُ اتَّقِ اللَّهَ فِينَا فَإِنَّمَا نَحْنُ بِكَ فَإِنْ اسْتَقَمْتَ اسْتَقَمْنَا وَإِنْ اعْوَجَجْتَ اعْوَجَجْنَا

2407 سنن الترمذي كتاب الزهد باب ما جاء في حفظ اللسان

452 المحدث السيوطي خلاصة حكم المحدث صحيح في الجامع الصغير