Mark 8:26

Probably Jesus gave this order to safeguard His mission (cf. Mark 1:44-45; Mark 5:43; Mark 7:36). The man appears to have lived somewhere other than in Bethsaida.

With this miracle Jesus fulfilled another aspect of messianic prophecy. The divine Messiah would open blind eyes (Isaiah 35:5-6). Old Testament writers claimed that it is God who gives sight to the blind (Psalms 146:8; Isaiah 29:18). The conclusion should have been obvious: Jesus is the God-man.