Abu Musa al-Ash‘ari reported Allah's Messenger ﷺ as saying

When you pray make your rows straight and let one of your number act as your imam. If you say the takbir when he says it and say Amen when he says “Not of those with whom Thou art angry nor of those who go astray”, Allah will accept your prayer. When he says the takbir and bows, say it and bow, for the imam bows before you and raises himself before you. Then Allah's Messenger ﷺ said, “The one is equivalent to the other.”* And he said: If you say, “O Allah our Lord, to Thee be the praise,” when he says, “Allah listens to him who praises him,” Allah will listen to you. * Although the imam begins and ends his bowing before you do, your bow lasts the same length of time as his. Muslim transmitted it. In a version by him from Abu Huraira and Qatada the words occur, “And when he recites listen silently.”