That when they were present with the Messenger of Allah in Al-Madinah, he sent the Hadi, and whoever wanted to enter Ihram did so, and whoever did not want to, did not. (Using translation from Nasāʾī 2792)  

عَنْ جَابِرٍ أَنَّهُمْ كَانُوا إِذَا كَانُوا حَاضِرِينَ مَعَ رَسُولِ اللهِ ﷺ بِالْمَدِينَةِ «يَبْعَثُ بِالْهَدْيِ فَمَنْ شَاءَ أَحْرَمَ وَمَنْ شَاءَ تَرَكَ»