Luke 21:1

And he looked up, and saw the rich men casting their gifts into the treasury.

Cross-reference

Matthew 27:6 records the priests refusing blood money for the treasury — contrasting with the acceptable gifts being placed there now.

Mark 12:41-44 is the parallel account of the same event — the widow's offering of two mites, providing additional details about her poverty.

Ezra 2:68 Parallel

Ezra 2:68 describes the heads of families giving freewill offerings to the temple treasury — directly parallel to the rich putting their gifts in here.

Nehemiah 7:71 records leaders giving to the treasury for the work — the same action of depositing gifts into the temple fund.

John 8:20 Historical context

John 8:20 places Jesus teaching in the treasury area — the same location where the rich are seen depositing their gifts.