Deuteronomy 25:18
how they met you on your journey when you were tired and weary, and they attacked all your stragglers; they had no fear of God.
What it says
Amalek attacked the stragglers when Israel was tired and weak, showing no fear of God.
What it is doing
It explains why Amalek stands under judgment.
In context
17Remember what the Amalekites did to you along your way from Egypt, 18how they met you on your journey when you were tired and weary, and they attacked all your stragglers; they had no fear of God. 19When the LORD your God gives you rest from the enemies around you in the land that He is giving you to possess as an inheritance, you are to blot out the memory of Amalek from under heaven. Do not forget!