This one came to mind as well: AN8.8
From the blurb:
In a discourse evidently set some time after the Buddha’s passing, Venerable Uttara, staying in a distant land, teaches that a mendicant should review their own failings and those of others. Questioned by Sakka, the Lord of Gods, Uttara affirms that he learned this from the Buddha.
Interesting essay by Bhante about this sutta: On AN 8.8 Uttaravipatti