It was narrated that Abdur-Rahman bin Yamur said:

"I saw the Messenger of Allah when people came to him and asked him about Hajj. The Messenger of Allah said: 'Hajj is Arafat. Whoever catches up with the night of Arafat before dawn comes on the night of Jam (Al-Muzdalifah), his Hajj is complete.'"

أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا وَكِيعٌ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ بُكَيْرِ بْنِ عَطَاءٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ يَعْمَرَ، قَالَ شَهِدْتُ رَسُولَ اللَّهِ ﷺ فَأَتَاهُ نَاسٌ فَسَأَلُوهُ عَنِ الْحَجِّ فَقَالَ رَسُولُ اللَّهِ ﷺ " الْحَجُّ عَرَفَةُ فَمَنْ أَدْرَكَ لَيْلَةَ عَرَفَةَ قَبْلَ طُلُوعِ الْفَجْرِ مِنْ لَيْلَةِ جَمْعٍ فَقَدْ تَمَّ حَجُّهُ " .