'Base' in the Bible

You came near and stood at the base of the mountain, a mountain blazing with fire into the heavens and enveloped in a dense, black cloud.

Certain base fellows are gone out from the midst of thee, and have drawn away the inhabitants of their city, saying, Let us go and serve other gods, which ye have not known;

Beware that there is no base thought in your heart, saying, ‘The seventh year, the year of remission, is near,’ and your eye is hostile toward your poor brother, and you give him nothing; then he may cry to the Lord against you, and it will be a sin in you.