The Prophet Samuel is mentioned after the Prophet Moses because among the Hebrews the sacred books were divided into three parts: the Law of Moses, the Prophets, and the Psalms.
The first of the prophets after Moses who wrote sacred books was the Prophet Samuel. The books of Judges, Ruth, and the two books of Kingdoms are attributed to him. Especially clear prophecies are found in 1 Kgdms 2:10 and 2 Kgdms 7:12.
The Apostle Peter does not touch here on the messianic Psalms, since he had recalled them earlier. What had been said was sufficient. Many of the hearers themselves knew the prophecies about the Messiah.
Read more (97 words)
Therefore the Apostle touches on Samuel chiefly for the effect of his authority, rather than by quoting his words. Quoting them would have required much time, and the evening of that day was already drawing to a close.
It should also be said that the venerable name of the Prophet Samuel had special and significant importance. He was the founder of the prophetic schools.
Those educated there under his beneficent influence soon received prophetic gifts. These sometimes acted even upon people little prepared for them. Thus once the prophetic spirit touched even Saul (cf. 1 Kgdms 10:11-12).