en_tn_lite_do_not_use/psa/106/026.md

raised his hand

The word "his" refers to Yahweh. Also, it was custom to raise a hand when swearing an oath.

scatter their descendants ... in foreign lands

These two phrases have basically the same meaning and are used together for emphasis. AT: "and that he would make their descendants live in foreign lands" (See: rc://en/ta/man/translate/figs-parallelism)

scatter

This means to disperse or spread out something.