Sources cited:

from II Samuel 6:14-22:

Then David danced before the Lord with all his might; and David was wearing a linen ephod. So David and all the house of Israel brought up the ark of the Lord with shouting and with the sound of the trumpet.

Now as the ark of the Lord came into the City of David, Michal, Saul’s daughter, looked through a window and saw King David leaping and whirling before the Lord; and she despised him in her heart. So they brought the ark of the Lord, and set it in its place in the midst of the tabernacle that David had erected for it. Then David offered burnt offerings and peace offerings before the Lord. And when David had finished offering burnt offerings and peace offerings, he blessed the people in the name of the Lord of hosts. Then he distributed among all the people, among the whole multitude of Israel, both the women and the men, to everyone a loaf of bread, a piece of meat, and a cake of raisins. So all the people departed, everyone to his house.

Then David returned to bless his household. And Michal the daughter of Saul came out to meet David, and said, “How glorious was the king of Israel today, uncovering himself today in the eyes of the maids of his servants, as one of the base fellows shamelessly uncovers himself!”

So David said to Michal, “It was before the Lord, who chose me instead of your father and all his house, to appoint me ruler over the people of the Lord, over Israel. Therefore I will play music before the Lord. And I will be even more undignified than this, and will be humble in my own sight. But as for the maidservants of whom you have spoken, by them I will be held in honor.”

from the Protoevangelium of James:

And the child was two years old, and Joachim said: Let us take her up to the temple of the Lord, that we may pay the vow that we have vowed, lest perchance the Lord send to us, and our offering be not received. And Anna said: Let us wait for the third year, in order that the child may not seek for father or mother. And Joachim said: So let us wait. And the child was three years old, and Joachim said: Invite the daughters of the Hebrews that are undefiled, and let them take each a lamp, and let them stand with the lamps burning, that the child may not turn back, and her heart be captivated from the temple of the Lord. And they did so until they went up into the temple of the Lord. And the priest received her, and kissed her, and blessed her, saying: The Lord has magnified your name in all generations. In you, on the last of the days, the Lord will manifest His redemption to the sons of Israel. And he set her down upon the third step of the altar, and the Lord God sent grace upon her; and she danced with her feet, and all the house of Israel loved her.

Sources not cited (which I intended to):

“Truly I tell you, unless you change and become like little children, you will never enter the kingdom of heaven.” (Matthew 18:3)

from For the Life of the World (Fr. Schmemann citing Romano Guardini):

Man, with the aid of grace, is given the opportunity of relaying his fundamental essence, of really becoming that which according to his divine destiny he should be and longs to be, a child of God. In the liturgy he is to go “unto God , who giveth joy to his youth.” … Because the life of the liturgy is higher than that to which customary reality gives either the opportunity or form of expression, it adapts suitable forms and methods from that sphere in which alone they are to be found, that is to say, from art. It speaks measuredly and melodiously; it employs formal, rhythmic gestures; it is clothed in colors and garments foreign to everyday life … It is in the highest sense the life of a child, in which everything is picture, melody and song. Such is the wonderful fact which the liturgy demonstrates: it unites act and reality in a supernatural childhood before God.

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