Mark 8:3
And if I send them away fasting to their own houses, they will faint by the way: for divers of them came from far.
Cross-reference
Mark 6:37
Parallel
In Mark 6:37, the disciples face a similar lack of food before the feeding of the 5000 — echoing the same concern.
Matthew 14:15
Parallel
In Matthew 14:15, the disciples similarly urge Jesus to send the crowd away to get food — a parallel scene before the first feeding.
Matthew 15:32
Parallel
Matthew 15:32 is the parallel account of this same feeding, identical concern for the crowd collapsing from hunger.