Al-Kāfi

Hadith 1260
ihram
6ـ أَحْمَدُ عَنْ عَلِيِّ بْنِ أَحْمَدَ بْنِ أَشْيَمَ عَنْ مُوسَى بْنِ عُمَرَ عَنْ مُحَمَّدِ بْنِ مَنْصُورٍ عَنْ أَبِي الْحَسَنِ (عَلَيْهِ السَّلاَم) قَالَ سَأَلْتُهُ عَنِ الظِّلالِ لِلْمُحْرِمِ قَالَ لا يُظَلِّلْ إِلاَّ مِنْ عِلَّةِ مَرَضٍ.
6. Ahmad has narrated from Ali ibn Ahmad ibn ‘Ushaym from Musa ibn ‘Umar from Muhammad ibn Mansur who has said the following: “I once asked abu al-Hassan (a.s.), about the case of a man in the state of Ihram and shadows. He (the Imam) said, ’He must not seek shadows unless he is ill.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī