إِنِّىٓ إِذًا لَّفِى ضَلَـٰلٍ مُّبِينٍ
“Indeed, I would then be clearly astray.”
Urwah ibn Mas'ud RA was killed by his own people just as he called them to the truth -- paralleling the man of Ya-Sin in these ayat (36:20-27), who was likewise killed by his people after urging them to follow the messengers.