Book of Exodus 23,20-23.
"See, I am sending an angel before you, to guard you on the way and bring you to the place I have prepared.
Be attentive to him and heed his voice. Do not rebel against him, for he will not forgive your sin. My authority resides in him.
If you heed his voice and carry out all I tell you, I will be an enemy to your enemies and a foe to your foes.
"My angel will go before you and bring you to the Amorites, Hittites, Perizzites, Canaanites, Hivites and Jebusites; and I will wipe them out.
Holy Gospel of Jesus Christ according to Saint Matthew 18,1-5.10.
The disciples approached Jesus and said, "Who is the greatest in the kingdom of heaven?"
He called a child over, placed it in their midst,
and said, "Amen, I say to you, unless you turn and become like children, you will not enter the kingdom of heaven.
Whoever humbles himself like this child is the greatest in the kingdom of heaven.
And whoever receives one child such as this in my name receives me.
See that you do not despise one of these little ones, for I say to you that their angels in heaven always look upon the face of my heavenly Father.