Chapter of the Talbiyah
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 3|Chapter 52
وَ فِي خَبَرٍ آخَرَ: «إِذَا نُودِيَ اَلْمُحْرِمُ فَلاَ يَقُلْ لَبَّيْكَ وَ لَكِنْ يَقُولُ يَا سَعْدُ ».
In another narration: "If a Muhrim is called, he should not say 'Labbayk,' but rather say 'Ya Sa'd.'"
- Ṣaḥīḥ al-Faqīh