´Mu'adh bin Jabal narrated that :` the Messenger of Allah said: "When one of you comes to the Salat and (finds) the Imam is in a position, then do as the Imam is doing."
Hadith Referenceسنن ترمذي / أبواب السفر / 591
Hadith Gradingالألبانی:صحيح، صحيح أبي داود (522) ، الصحيحة (1188) | زبیر علی زئی:(591) إسناده ضعيف, الحجاج بن أرطاة ضعيف مدلس (تقدم:527) وللحديث شواھد ضعيفة عند أبى داود (506) وغيره
Hadith Takhrij«تفرد بہ المؤلف ( تحفة الأشراف : 10306، 11345) (صحیح) (سند میں حجاج بن ارطاة کثیر الخطأ راوی ہیں، لیکن شواہد کی بنا پر یہ حدیث صحیح ہے)»
Commentary: Note: (In the chain of narration, Hajjaj ibn Arta’ah is a narrator who makes many mistakes, but on the basis of corroborating evidences, this hadith is authentic.)
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 591
Narrated 'Ali bin Abi Talib (RA): Allah's Messenger (ﷺ) said: "If one of you comes to Salat (prayer) and the Imam is at a certain position, he must do as the Imam is doing." [Reported by at-Tirmidhi with a weak chain of narrators].