Jacob is reading from the book of Hebrews Chapter 5:10-14, Hebrews 9:13-14.
Jacob is explaining, the meat and the milk, the meat is the Old Testament, and the milk is the New Testament, only exception is the book of Revelation which is meet.
(So every Christian should have a balanced diet of the word).
Jacob is reading from Hebrews 9:13, Jacob is describing the rigid conditions that had to be followed before any red heifer, could be considered worthy for sacrifice.
Hebrews 5 New American Standard Bible
The Perfect High Priest
10 being designated by God as a high priest according to the order of Melchizedek.
11 Concerning [g]him we have much to say, and it is hard to explain, since you have become dull of hearing.
12 For though [h]by this time you ought to be teachers, you have need again for someone to teach you the [i]elementary principles of the oracles of God, and you have come to need milk and not solid food.
13 For everyone who partakes only of milk is not accustomed to the word of righteousness, for he is an infant.
14 But solid food is for the mature, who because of practice have their senses trained to discern good and evil.
Hebrews 9 New American Standard Bible
The Old and the New
13 For if the blood of goats and bulls and the ashes of a heifer sprinkling those who have been defiled sanctify for the [n]cleansing of the flesh,
14 how much more will the blood of Christ, who through [o]the eternal Spirit offered Himself without blemish to God, cleanse [p]your conscience from dead works to serve the living God?
Jacob explains Hebrews 9:13-14, in great detail, pay attention.
Some of you may not be familiar with Moriel Ministries, so I will take a few minutes to explain one of the things that we do. We try to help Christians to understand the Bible in its original context of the first century Church, which was established by the Lord through Jewish Christians. We try to read the Bible the same way the early Jewish church would have read it. There have been others who have tried to do that through the centuries, with varying degrees of success most notably the Plymouth Brethren. We believe it to be important in the Last Days to understand how to interpret the Bible in the way the first century Church did.