Zechariah 4:3

4:3 There are also two olive trees beside it, one on the right of the receptacle and the other on the left.” ¹ 

Zechariah 4:11

4:11 Next I asked the messenger, “What are these two olive trees on the right and the left of the menorah?”

Zechariah 14:4

14:4 On that day his feet will stand on the Mount of Olives which lies to the east of Jerusalem, and the Mount of Olives will be split in half from east to west, leaving a great valley. Half the mountain will move northward and the other half southward. ² 

[4:3]  ¹ sn The vision apparently describes two olive trees providing olive oil by pipes to a large basin atop the menorah. From this basin two pipes extend to each of the seven lamps of the menorah, for a total of fourteen pipes in all. See vv. 11-12.

[14:4]  ² sn This seismic activity provides a means of escape from Jerusalem so that the Messiah (the Lord), whose feet will stand on the Mount of Olives, may destroy the wicked nations in the Kidron Valley (the v. of Jehoshaphat, or of “judgment of the Lord”) without harming the inhabitants of the city.