(Al-Hajj) 22 : 77
يَا أَيُّهَا الَّذِينَ آمَنُوا ارْكَعُوا وَاسْجُدُوا وَاعْبُدُوا رَبَّكُمْ وَافْعَلُوا الْخَيْرَ لَعَلَّكُمْ تُفْلِحُونَ ۩
Oh, you who believed! You bow down, you prostrate, you serve your Lord and you do good deeds, so that you may become prosperous.
This verse is the second Prostration of Recitation in this Surath which is compulsory to those who read or hear. While Messenger was asked that, is it compulsory to do prostration while hearing both verses of Prostration of Recitation of this Surath, he replied that, it is compulsory and else one shouldn’t read or hear these verses. See explanation 22: 18.