Genesis 37:32

And they sent the coat of many colours, and they brought it to their father; and said, This have we found: know now whether it be thy son’s coat or no.

Cross-reference

In Genesis 37:3, Jacob gave Joseph this special robe — now the brothers use the same robe to deceive him.

Genesis 44:20–23 Historical context

In Genesis 44:20-23, Jacob still mourns Joseph as lost — this deception here causes years of grief.