Mark 9:34-37

But they kept quiet, because on the road they had discussed and debated with one another which one [of them] was the greatest. Sitting down [to teach], He called the twelve [disciples] and said to them, “If anyone wants to be first, he must be last of all [in importance] and a servant of all.” Taking a child, He set him before them; and taking him in His arms, He said to them, “Whoever receives and welcomes one child such as this in My name receives Me; and whoever receives Me receives not [only] Me, but Him who sent Me.” [Matt 10:40; Luke 10:16; John 13:20]