Comentario citado sobre I Samuel 17:12

An Efrati:. This is said about two facets. The one relates to the tribe, concerning one who is from the tribe of Ephraim, or someone who lives in the Land of Ephraim - as in, "Are you an Efrati" (Judges 12:5). And the [other] relates to Beit Lechem-Efrat - as in, "and David was an Efrati" (I Samuel 17:12); "Machlon and Khiliyon were Efrati" (Ruth 1:2). And this concerns Mount Ephraim, as it stated (here), "from Mount Ephraim." And that is why, it called him an Efrati. For we can not explain that he was an Efrati concerning the tribe of Ephraim, since he was a Levite. If so, that which it stated, "an Efrati," is that he was from Mount Ephraim. But it is a wonder - after it stated, "from Mount Ephraim," why did it state, "an Efrati," afterwards? And it is possible that it also said it because he and his forefathers lived there. So it stated, "Efrati," about Tzuf, not about Elkanah. For it already explained about Elkanah, "from Mount Ephraim." This is correct, according to the simple understanding. And that which it stated that he and his forefathers had lived in Mount Ephraim appears to be because their inheritance was there, as they were from the sons of Kehat. And the sons of Kehat had cities in Mount Ephraim, as it stated in the book of Yehoshua (Joshua 21:20), "And to the sons of Kehat, the Levites, etc. Shechem and its fields on Mount Ephraim." But the homiletical teaching explains it as an expression of greatness and importance:

Abihail the daughter of Eliab Like: and Abihail, similar to (Jer. 11:19): “And I was like a lamb and a bull (כְּכֶבֶשׂ אַלּוּף).” The following was the reason that Samuel the seer erred when Jesse passed Eliab before Samuel, and he [Samuel] said, (I Sam. 16:6): “Surely before the Lord is His anointed.” This is the one about whom the Holy One, blessed be He, is destined to say, “Arise, anoint him, for this is he.” But Samuel erred about him, for he saw Eliab’s daughter as Rehoboam’s wife, the queen, and because of the following matter, Samuel was punished: When Saul asked him, (ibid. 9: 18) “Which is the house of the seer?” Samuel replied, “I am the seer,” in which case he did not answer him with humility, saying, “What do you wish.” [Therefore,] the Holy One, blessed be He, said to him, “By your life, you are destined to see, and you will not know what you see,” for he erred concerning Eliab and his daughter the queen.