en_tn/deu/32/25.md

Moses speaks a poetic song to the people of Israel. Moses continues to use parallelism to emphasize what he is saying. (See: rc://en/ta/man/translate/figs-parallelism)

Outside the sword will bereave

Here "sword" represents the army of the enemy. AT: “When the Israelites are outside, the enemy army will kill them” (See: rc://en/ta/man/translate/figs-metonymy)

young man and virgin, the nursing baby, and the man of gray hairs

These terms are combined to mean that all kinds of people will die. (See: rc://en/ta/man/translate/figs-merism)

I would make the memory of them to cease from among mankind

AT: "I will remove the memory of them from all people" or "I will make all people forget about them"