After the multitude had been fed, there was an abundance of food left. But He who had all the resources of infinite power at His command said, “Gather up the fragments that remain, that nothing be lost.” These words meant more than putting the bread into the baskets. The lesson was twofold. Nothing is to be wasted. We are to let slip no temporal advantage. We should neglect nothing that will tend to benefit a human being. Let everything be gathered up that will relieve the necessity of earth's hungry ones. And there should be the same carefulness in spiritual things. When the baskets of fragments were collected, the people thought of their friends at home. They wanted them to share in the bread that Christ had blessed. The contents of the baskets were distributed among the eager throng, and were carried away into all the region round about. So those who were at the feast were to give to others the bread that comes down from heaven, to satisfy the hunger of the soul. They were to repeat…
"When they were filled, he said unto his disciples, Gather up the fragments that remain, that nothing be lost."
EGW directly quotes John 6:12 and then expands on the meaning of the verse, making it a clear explicit allusion.
"And they did all eat, and were filled: and they took up of the fragments that remained twelve baskets full."
Both passages refer to the gathering of fragments after the feeding of the multitude. While EGW quotes John 6:12, the broader context of the feeding of the 5000 in Matthew 14:20 is also relevant, making it a thematic parallel.