'Happened' in the Bible

So Aaron said to Moses, "Look, today they presented their sin offering and their burnt offering {before} Yahweh, and [things] such as these have happened to me, and [if] I were to eat a sin offering today, would it have been good in Yahweh's eyes?"

And any person who touches anything that happened to be under him becomes unclean until the evening, and the person who carries them must wash his garments, and he shall wash [himself] with water, and he shall be unclean until the evening.