'By My Spirit' in the Bible

Woe to the rebellious children, saith Jehovah, who take counsel, but not of me, and who make leagues, but not by my Spirit, that they may heap sin upon sin;

And he answered and spoke unto me, saying, This is the word of Jehovah unto Zerubbabel, saying, Not by might, nor by power, but by my Spirit, saith Jehovah of hosts.