The verb “send” or “sent” is used 32 times in the Gospel of John. Being “sent” matters as it becomes a question of authority, position, power, and jurisdiction. Think of some children playing together. One of them decides to begin climbing a fence. “Hey, you aren’t allowed to do that!” says one of the other children. “Oh yeah? Who sent you to be in charge?” retorts the climber.
Being sent by someone carries with it weight. Representatives act on behalf of others who otherwise are not present. Those who are sent often bear a message, or act on behalf of the sending party. In John’s Gospel the issue of who sent Jesus is one that continually comes up. “πέμπω” (Pempo is how you pronounce this ancient Greek word) is the word that gets used to denote being sent, or sending.
30 out of the 32 uses of this word are by Jesus (the other two instances are people questioning John the Baptist in 1:22 and John the Baptist in 1:33). While teaching Jesus would frequently refer to the one who sent him:
22 Moreover, the Father judges no one, but has entrusted all judgment to the Son, 23 that all may honor the Son just as they honor the Father. Whoever does not honor the Son does not honor the Father, who sent him. (Jn 5:22–23)
36 “I have testimony weightier than that of John. For the works that the Father has given me to finish—the very works that I am doing—testify that the Father has sent me. (Jn 5:36)