The Sufficient (Vol 4) · Hadith 1261 (#Ḥadīth #7)
Chapter 90 | Use of Shadow in the State of al-’Ihram
7ـ أَحْمَدُ عَنْ عُثْمَانَ بْنِ عِيسَى الْكِلابِيِّ قَالَ قُلْتُ لأَبِي الْحَسَنِ الأَوَّلِ (عَلَيْهِ السَّلاَم) إِنَّ عَلِيَّ بْنَ شِهَابٍ يَشْكُو رَأْسَهُ وَالْبَرْدُ شَدِيدٌ وَيُرِيدُ أَنْ يُحْرِمَ فَقَالَ إِنْ كَانَ كَمَا زَعَمَ فَلْيُظَلِّلْ وَأَمَّا أَنْتَ فَاضْحَ لِمَنْ أَحْرَمْتَ لَهُ.
7. Ahmad has narrated from ‘Uthman ibn ‘Isa al-Kilabiy who has said the following: “I once said to abu al-Hassan , that Ali ibn Shihab has a headache, and cold is severe and he wants to assume the state of Ihram. He (the Imam) said, ‘If that is the case he can use shadows, but you must stay out of the shadow for the sake of the One for whom you assume the state of Ihram.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).