صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب الأفعال المباحة فى الصلاةChapters on Permissible Acts in Prayer
(326) بَابُ إِبَاحَةِ الْتِفَاتِ الْمُصَلِّي فِي الصَّلَاةِ عِنْدَ إِرَادَةِ تَعْلِيمِ الْمُصَلِّينَ بِالْإِشَارَةِ إِلَيْهِمْ بِمَا يَفْهَمُونَ عَنْهُ،326 Chapter: Permissibility of Turning in Prayer to Teach Others by Gesturing.
Hadith Q873
وَفِيهِ مَا دَلَّ عَلَى أَنَّ إِشَارَةَ الْمُصَلِّي بِمَا يُفْهَمُ عَنْهُ غَيْرُ مُفْسِدَةٍ صَلَاتَهُ
And in this is evidence that a gesture by the one praying, which people understand, does not invalidate or corrupt the prayer.
