Hadithcore
Mishkat al-Masabih, 957

‘A’isha said that God’s Messenger used to give one salutation in the prayer straight in front of him, then incline a little to the right. Tirmidhi transmitted it.

وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُول الله صلى يُسَلِّمُ فِي الصَّلَاةِ تَسْلِيمَةً تِلْقَاءَ وَجْهِهِ ثُمَّ تميل إِلَى الشق الْأَيْمن شَيْئا. رَوَاهُ التِّرْمِذِيّ

References1 variant
In-Book Reference
Book 4, Hadith 380