With this chain, a similar hadith is narrated from Abu Sa'id Al-Khudri (may Allah be pleased with him), but Salih bin Abdullah narrated it with doubt as to whether Abu Sa'id Al-Khudri (may Allah be pleased with him) narrated it as a marfu' (attributed) report from the Prophet (peace and blessings of Allah be upon him), and then he narrated the entire hadith in the same manner.
´Abu Sa'eed Al-Khudri narrated (that the Prophet s.a.w) said:` "When the son of Adam wakes up in the morning, all of his body parts bow to the tongue and say: 'Fear Allah regarding us, we are only part of you. If you are straight we are straight and if you are crooked we are crooked."
Hadith Referenceسنن ترمذي / كتاب الزهد عن رسول الله صلى الله عليه وسلم / 2407
1؎: In this hadith, the tongue is described as the center of the rectification of all the limbs, whereas from other ahadith it is understood that the heart is the center of all of them. The reconciliation is that the tongue holds the position of being the interpreter of the body; therefore, metaphorically, it has been called the center of all the limbs, otherwise, the true center is the heart, not the tongue.
Explanation & Benefits
Shaykh Dr. Abdur Rahman Freywai
Explanation: 1: In this hadith, the tongue is described as the center of the rectification of all the limbs, whereas from other hadiths it is understood that the heart is the center of all of them. The reconciliation is that the tongue holds the position of being the interpreter of the body, and therefore, metaphorically, it has been called the center of all the limbs. Otherwise, the true center is the heart, not the tongue.
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 2407