Luke 21:1
And he looked up, and saw the rich men casting their gifts into the treasury.
Cross-reference
Matthew 27:6
Contrast
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
Parallel
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
Parallel
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.