Chapter on Virtues of Hajj
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 3|Chapter 2
وَ رَوَى مُحَمَّدُ بْنُ مُسْلِمٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ: «لاَ يَنْبَغِي لِأَحَدٍ أَنْ يَأْخُذَ مِنْ تُرْبَةِ مَا حَوْلَ اَلْبَيْتِ وَ إِنْ أَخَذَ مِنْ ذَلِكَ شَيْئاً رَدَّهُ.
It has been narrated from Muhammad ibn Muslim, from Abu Abdullah عليه السلام: "It is not appropriate for anyone to take soil from around the House (Kaaba), and if someone takes anything from it, they must return it."
- Ṣaḥīḥ al-Faqīh, p. 116