The interpretation timeline
Mark 8:15 Douay-Rheims

And he charged them, saying: Take heed and beware of the leaven of the Pharisees, and of the leaven of Herod.

A.D. 735 – 1863 7 witnesses 8 excerpts

Patristic

before A.D. 750
735
A.D.
Bede the Venerable Patristic
c. A.D. 672–735
“(ubi sup.) Or, the leaven of the Pharisees is making the decrees of the divine law inferior to the traditions of men, preaching the law in word, attacking it in deed, tempting the Lord, and disbelieving His doctrine and His works; but the leaven of Herod is adultery, murder, rash swearing, a pretence of religion, hatred to Christ and His forerunner.”
Source

Scholastic

c. 1100 – 1500
1107
A.D.
c. 1055–1107
“By a special providence1 also the disciples forgot to take bread, that they might be blamed by Christ, and thus become better, and arrive at a knowledge of Christ’s power. For it goes on, And he charged them, saying, Take heed, and beware of the leaven of the Pharisees and of the leaven of Herod.”
“He means by leaven their hurtful and corrupt doctrine, full of the old malice, for the Herodians were the teachers, who said that Herod was the Christ.”

Reformation

c. 1500 – 1650
1637
A.D.
1567–1637
“Beware of the leaven of the Pharisees and of the leaven of Herod, The leaven is the doctrine of the Pharisees, by which they taught children to say to their parents corban, , as well as other things contrary to the law of God. The leaven of Herod is the doctrine of the Sadducees, for with them Christ had had His most recent controversy, as appears from Matt xvi. 1-12. For Herod, as well as many of the principal people at that time, were Sadducees (see fos . xviil c. 2). They denied the immortality of the soul, and lived as Atheists. So Herod lived in adultery, killed John, and committed many other crimes, having no fear of God For although he thought that John had risen again in Christ, yet that opinion did not arise out of faith, but was wrung out of him by fear. Others, with Origen and S. Jerome, understand by leaven the sect of the Herodians, who flattered Herod, saying that he was the Messiah. But that referred to Herod of Ascalon, not Herod Antipas, as I have shown on Matt xxii. 16”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And he charged them,.... When they were in the ship, and had just recollected themselves, that they had took no care to bring any provisions with them: saying, take heed, beware of the leaven of the Pharisees; and of the leaven of Herod: in Matthew, instead of "the leaven of Herod", it is read, "the leaven of the Sadducees": which are either the same, Herod and his courtiers being Sadducees, or favourers of them; or the Sadducees being sticklers for Herod, and his government, which the Pharisees had no good opinion of; or else distinct from one another; and so Christ cautions against the doctrines of the Pharisees, which regarded the traditions of the elders, and of the Sadducees, concerning the resurrection, and of the Herodians, who thought Herod to be the Messiah; and against the unreasonable request and demand of them all to have a sign from heaven, in proof of his own Messiahship; See Gill on Mat 16:6.”
Source
1849
A.D.
1774–1849
“Of the leaven of Herod. In St. Matthew chap. xvi. ver. 6, we read of the leaven of the Pharisees and Sadducees: we may conclude that Christ named all of them. (Witham)”
1863
A.D.
1796–1863
“St. Matthew makes mention of the leaven of the Sadducees, without naming Herod. Probably this prince favored their errors. His guile and duplicity were also to be guarded against.”

Undated

date unknown
date
unknown
“(Vict. Ant. e Cat. in Marc.) Matthew says, of the leaven of the Pharisees and of the Sadducees; Luke, however, of the Pharisees only. All three, therefore, name the Pharisees, as being the most important of them, but Matthew and Mark have each mentioned one of the secondary sects; and fitly has Mark added of Herod, as a supplement to Matthew’s narrative, in which they were left out. But in saying this, He by degrees brings the disciples to understanding and faith.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.