Deuteronomy 25:17

Remember what Amalek did unto thee by the way, when ye were come forth out of Egypt;

Exodus 17:8-16

Then came Amalek, and fought with Israel in Rephidim.

Numbers 24:20

And when he looked on Amalek, he took up his parable, and said, Amalek was the first of the nations; but his latter end shall be that he perish for ever.

Numbers 25:17-18

Vex the Midianites, and smite them:

Treasury of Scripture Knowledge

Summary

Remember what Amalek did unto thee by the way, when ye were come forth out of Egypt;

Bible References

General references

Exodus 17:8
Then came Amalek, and fought with Israel in Rephidim.
Numbers 24:20
And when he looked on Amalek, he took up his parable, and said, Amalek was the first of the nations; but his latter end shall be that he perish for ever.
Numbers 25:17
Vex the Midianites, and smite them:

King James Version Public Domain