Matthew 15:34 is the earlier narrative where the disciples report seven loaves, directly informing Jesus' reference here.

Matthew 15:38 gives the count of 4,000 men fed, which Jesus recalls to show the abundance in the feeding miracle.

Matthew 15:37 records the feeding of the 4000 referenced here — the seven baskets of leftovers Jesus recalls.

Mark 8:5-9 gives the parallel account of the feeding of the 4,000, detailing the same miracle Jesus refers to here.

Mark 8:17-21 parallels this whole rebuke, recording Jesus' identical question about the seven loaves and the disciples' continued misunderstanding.

Mark 8:8 gives the parallel account of the same feeding miracle, also noting seven baskets of leftovers.