The Scofield Bible Commentary, by Cyrus Ingerson Scofield, [1917], at sacred-texts.com
Isaiah Chapter 7
Ephraim
In the prophetic books "Ephraim" and "Israel" are the collective names of the ten tribes who, under Jeroboam, established the northern kingdom, subsequently called Samaria (Kg1 16:24) and were (B.C. 722) sent into an exile which still continues. (Kg2 17:1-6).
They are distinguished as "the outcasts of Israel" from "the dispersed of Judah." (Isa 11:12). "Hidden" in the world (Mat 13:44) they, with Judah, are yet to be restored to Palestine and made one nation again. (Jer 23:5-8); (Eze 37:11-24).
Shearjashub
Meaning, a remnant shall return. (Isa 8:3).
Hear ye now
The prophecy is not addressed to the faithless Ahaz, but to the whole "house of David." The objection that such a far-off event as the birth of Christ could be no "sign" to Ahaz, is, therefore, puerile. It was a continuing prophecy addressed to the Davidic family, and accounts at once for the instant assent of Mary. (Luk 1:38).
Butter and honey
Indicating the plainness and simplicity of the life in which the young Immanuel should be brought up.