Greatest

Exodus 23:20-23

20"Behold, I send an angel before you, to guard you on the way and to bring you to the place which I have prepared.  21Give heed to him and hearken to his voice, do not rebel against him, for he will not pardon your transgression; for my name is in him. 22"But if you hearken attentively to his voice and do all that I say, then I will be an enemy to your enemies and an adversary to your adversaries. 23"When my angel goes before you, and brings you in to the Amorites, and the Hittites, and the Per'izzites, and the Canaanites, the Hivites, and the Jeb'usites, and I blot them out, 

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Responsorial Psalm

Psalms 91:1-6, 10-11

1He who dwells in the shelter of the Most High, who abides in the shadow of the Almighty, 2will say to the LORD, "My refuge and my fortress; my God, in whom I trust." 3For he will deliver you from the snare of the fowler and from the deadly pestilence; 4he will cover you with his pinions, and under his wings you will find refuge; his faithfulness is a shield and buckler. 5You will not fear the terror of the night, nor the arrow that flies by day, 6nor the pestilence that stalks in darkness, nor the destruction that wastes at noonday. 10no evil shall befall you, no scourge come near your tent. 11For he will give his angels charge of you to guard you in all your ways. 

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Gospel

Matthew 18:1-5, 10

1At that time the disciples came to Jesus, saying, "Who is the greatest in the kingdom of heaven?" 2And calling to him a child, he put him in the midst of them,  3and said, "Truly, I say to you, unless you turn and become like children, you will never enter the kingdom of heaven.  4Whoever humbles himself like this child, he is the greatest in the kingdom of heaven.  5"Whoever receives one such child in my name receives me;  10"See that you do not despise one of these little ones; for I tell you that in heaven their angels always behold the face of my Father who is in heaven.