Sunan Ibn Majah
1427
Sahih+3

It was narrated from Abu Hurairah that the Prophet (ﷺ) said:“Is anyone of you incapable, when he prays, of stepping forwards or backwards, or to his right or left?” meaning in order to offer a voluntary prayer

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi