Zakharia 4:6

4:6 Therefore he told me, “These signify the word of the Lord to Zerubbabel: ‘Not by strength and not by power, but by my Spirit,’ ¹  says the Lord who rules over all.”

Zakharia 11:11

11:11 So it was annulled that very day, and then the most afflicted of the flock who kept faith with me knew that that was the word of the Lord.

[4:6]  ¹ sn It is premature to understand the Spirit here as the Holy Spirit (the third Person of the Trinity), though the OT prepares the way for that NT revelation (cf. Gen 1:2; Exod 23:3; 31:3; Num 11:17-29; Judg 3:10; 6:34; 2 Kgs 2:9, 15, 16; Ezek 2:2; 3:12; 11:1, 5).