'Teach' in the Bible

Many groups of people will come, commenting, "Come! Let's go up to the Temple of the God of Jacob, that they may teach us his ways. Then let's walk in his paths." "Instruction will proceed from Zion, and the word of the LORD from Jerusalem.

To whom will he teach knowledge, and to whom will he explain the message? To children just weaned from milk? To those just taken from the breast?