Mishkat al-Masabih 9 Supplications كتاب الدعوات 29

وَعَن سهل بن سَعْدٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: كَانَ يَجْعَل أصبعيه حذاء مَنْكِبَيْه وَيَدْعُو

Sahl b. Sa‘d told of the Prophet being accustomed to place his two fingers opposite his shoulders and make supplication.