Not graded
Riyad as-Salihin 1838
وعنه أن رسول الله صلى الله عليه وسلم قال:
"يصلون لكم، فإن أصابوا فلكم، وإن أخطؤوا فلكم وعليهم"
Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "Your leaders will lead you in Salat (prayer). If they conduct it properly, you and they will be rewarded; but if they make mistakes you will earn the reward and they will be held responsible (for the mistakes)."
[Al- Bukhari].
Cited in Riyad as-Salihin (No. 1838).