“O Messenger of Allah, is Hajj (required) every year, or just once” He said: “Rather it is just once. And whoever can perform Hajj voluntarily, let him do so.”
أَنَّ الأَقْرَعَ بْنَ حَابِسٍ سَأَلَ النَّبِيَّ ﷺ فَقَالَ يَا رَسُولَ اللَّهِ الْحَجُّ فِي كُلِّ سَنَةٍ أَوْ مَرَّةً وَاحِدَةً قَالَ بَلْ مَرَّةً وَاحِدَةً فَمَنِ اسْتَطَاعَ فَتَطَوُّعٌ