عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ قَالَ: ((عَلَى كُلِّ مُسْلِمٍ حَجَّةٌ، وَلَوْ قُلْتُ كُلَّ عَامٍ لَكَانَ))
Narrated by Sayyiduna Abdullah bin Abbas (may Allah be pleased with him): The Noble Prophet (peace and blessings be upon him and his family) said: Performing Hajj once is obligatory upon every Muslim, and if I had said that it is obligatory every year, then it would have become so.