'Direct' in the Bible

They may assist their brothers in the Tent of Meeting to keep an obligation, but they shall do no [heavy or difficult] work. Thus you shall deal with the Levites concerning their obligations.”

but Korah's direct descendants didn't die.

Now the daughters of Hepher's son Zelophehad, Gilead's grandson, who had been fathered by Machir, who had been fathered by Manasseh, from the tribe of Manasseh, the direct son of Joseph, were named Mahlah, Noah, Hoglah, Milcah, and Tirzah. They approached