Bereishis Rabah (39:12): Why did Mordechai want to save the Arel (Achashverosh)? He saw that Yakov blessed Pharaoh, Yosef revealed to him, and Daniel revealed to Nebuchadnetzar (so he did similarly).

Bereishis Rabah 100:12: Moshe learned from the Avos. Yitzchak concluded his Brachos to Yakov with "va'Yikra Yitzchak El Yakov" (Bereishis 28:1), and Yakov began with "va'Yikra Yakov" (ibid., 49:1). Ya'akov ended with "v'Zos [Asher Diber Lahem]" (ibid., 49:28), so Moshe began with v'Zos. Moshe ended with "Ashrecha Yisrael", and David began [Tehilim] with "Ashrei ha'Ish."

Shocher Tov (23:2): There is no lowlier trade than shepherding - he always goes with his staff and sack. How could David call Hashem "Ro'i"? He learned from Yakov, who said "ha'Elokim ha'Ro'eh Osi" (Bereishis 48:15).

Radak #1: This repeats the matter [of the previous verse] in different words.

Radak #2: Verse 99 discusses those who teach via intellect; "mi'Zekenim" is from Kabalah.

Malbim: There are Chachamim who studied history and early times. They do not get a clear knowledge from all the research. I understand more than them, via the Pikudim that I guarded. They arouse about Hashem's deeds in earlier days. Via doing them, this carves into the Nefesh more than what the Chachamim understood via their actions.

Radak: Initially, in my youth, I guarded Pikudim via tradition. After, I contemplated, and I guarded them via intellect.