وَعَنْهُ قَالَ: خَطَبَنَا رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: «إِنَّ اَللَّهَ كَتَبَ عَلَيْكُمُ اَلْحَجَّ «فَقَامَ اَلْأَقْرَعُ بْنُ حَابِسٍ فَقَالَ: أَفِي كَلِّ عَامٍ يَا رَسُولَ اَللَّهِ? قَالَ: «لَوْ قُلْتُهَا لَوَجَبَتْ، اَلْحَجُّ مَرَّةٌ، فَمَا زَادَ فَهُوَ تَطَوُّعٌ»
“Had I said ‘yes’, it would have become a (yearly) obligation. Hajj is obligatory only once in one’s lifetime. Whatever one does over and above this is supererogatory (a voluntary act) for him.” Related by the five Imams except for at-Tirmidhi.
Bulugh al-Maram 828, Book 6, Hajj, Hadith 13. 1 min read