Matthew 18:1-9
1 At that time the disciples came to Jesus and asked, “Who is greatest in the kingdom of heaven?”
2 He called a little child and set him before them, 3 and said, “I assure you and most solemnly say to you, unless you repent [that is, change your inner self—your old way of thinking, live changed lives] and become like children [trusting, humble, and forgiving], you will never enter the kingdom of heaven. 4 Therefore, whoever humbles himself like this child is greatest in the kingdom of heaven. 5 Whoever receives and welcomes one child like this in My name receives Me;
6 but whoever causes one of these little ones who believe in Me to stumble and sin [by leading him away from My teaching], it would be better for him to have a heavy millstone [as large as one turned by a donkey] hung around his neck and to be drowned in the depth of the sea. 7 “Woe (judgment is coming) to the world because of stumbling blocks and temptations to sin! It is inevitable that stumbling blocks come; but woe to the person on whose account or through whom the stumbling block comes! 8 “If your hand or your foot causes you to stumble and sin, cut it off and throw it away from you [that is, remove yourself from the source of temptation]; it is better for you to enter life crippled or lame, than to have two hands or two feet and be thrown into everlasting fire. 9 If your eye causes you to stumble and sin, pluck it out and throw it away from you [that is, remove yourself from the source of temptation]; it is better for you to enter life with only one eye, than to have two eyes and be thrown into the fiery hell.
Mark 9:33-37
33 They arrived at Capernaum; and when He was in the house, He asked them, “What were you discussing and arguing about on the road?” 34 But they kept quiet, because on the road they had discussed and debated with one another which one [of them] was the greatest. 35 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.” 36 Taking a child, He set him before them; and taking him in His arms, He said to them, 37 “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.”
Luke 9:46-48
46 An argument started among them as to which of them might be the greatest [surpassing the others in esteem and authority]. 47 But Jesus, knowing what they were thinking in their heart, took a child and had him stand beside Him, 48 and He told them, “Whoever welcomes this child in My name welcomes Me; and whoever welcomes Me [also] welcomes Him who sent Me; for the one who is least among all of you [that is, the one who is genuinely humble—the one with a realistic self-view]—he is the one who is [truly] great.”