"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.'"
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
"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.'" (Using translation from Nasāʾī 3016)
شَهِدْتُ رَسُولَ اللهِ ﷺ بِعَرَفَةَ وَأَتَاهُ نَاسٌ مِنْ أَهْلِ نَجْدٍ فَسَأَلُوهُ عَنِ الْحَجِّ فَقَالَ رَسُولُ اللهِ ﷺ «الْحَجُّ عَرَفَةُ فَمَنْ أَدْرَكَ لَيْلَةَ عَرَفَةَ قَبْلَ طُلُوعِ الْفَجْرِ مِنْ لَيْلَةِ جَمْعٍ فَقَدْ تَمَّ حَجَّهُ»