I came across something which goes like
“My shirt and the janazah prayer I performed will not save him from the torture of my Lord. However, I hope that one thousand people from his tribe will become sincere Muslims thanks to them.”[9]
Indeed, one thousand people became Muslims when they saw that the Messenger of God treated Abdullah b. Ubay so graciously.[10]
The sources for his are [9]Tabari, Tafsir, Vol. 10, 206.
[10]Ayni, Umdatu’l-Qari, Vol. 8, p. 54.
Do both have an isnad and are they authentic? Thank you very much