Thou shalt anoint Aaron and his sons - For the reason of this anointing, see Clarke's note on Exodus 29:7. It seems that this anointing oil was an emblem of Divine teaching, and especially of those influences by which the Church of Christ was, in the beginning, guided into all truth; as is evident from the allusion to it by St. John: "Ye have an unction from the Holy One, and ye know all things. The anointing which ye have received from him abideth in you, and ye need not that any man teach you; but as the same anointing teacheth you of all things, and is truth, and is no lie, and even as it hath taught you, ye shall abide in Him; 1 John 2:20, 1 John 2:27.

man's

Leviticus 21:10 And he that is the high priest among his brothers, on whose head the anointing oil was poured...

Matthew 7:6 Give not that which is holy to the dogs, neither cast you your pearls before swine, lest they trample them under their feet...

it is

Exodus 30:25,37,38 And you shall make it an oil of holy ointment, an ointment compound after the are of the apothecary: it shall be an holy anointing oil...

"Whereby we Cry, Abba, Father. "
Rom. viii. 15.--"Whereby we cry, Abba, Father." As there is a light of grace in bestowing such incomparably high dignities and excellent gifts on poor sinners, such as, to make them the sons of God who were the children of the devil, and heirs of a kingdom who were heirs of wrath; so there is a depth of wisdom in the Lord's allowance and manner of dispensing his love and grace in this life. For though the love be wonderful, that we should be called the sons of God; yet, as that apostle speaks, …
Hugh Binning—The Works of the Rev. Hugh Binning

Prayer
But I give myself unto prayer.' Psa 109: 4. I shall not here expatiate upon prayer, as it will be considered more fully in the Lord's prayer. It is one thing to pray, and another thing to be given to prayer: he who prays frequently, is said to be given to prayer; as he who often distributes alms, is said to be given to charity. Prayer is a glorious ordinance, it is the soul's trading with heaven. God comes down to us by his Spirit, and we go up to him by prayer. What is prayer? It is an offering …
Thomas Watson—The Ten Commandments

Exodus
The book of Exodus--so named in the Greek version from the march of Israel out of Egypt--opens upon a scene of oppression very different from the prosperity and triumph in which Genesis had closed. Israel is being cruelly crushed by the new dynasty which has arisen in Egypt (i.) and the story of the book is the story of her redemption. Ultimately it is Israel's God that is her redeemer, but He operates largely by human means; and the first step is the preparation of a deliverer, Moses, whose parentage, …
John Edgar McFadyen—Introduction to the Old Testament