en_tn_lite_do_not_use/zec/13/01.md

a spring of water

A place where water flows naturally out of the ground.

for their sin and impurity

AT: "to cleanse their sin and impurity"

will be on that day

This refers to the time that the spring is opened.

This is Yahweh of hosts' declaration

This phrase is often translated as “Yahweh says” in the UDB. You can translate this concept whichever way is best in your language. This phrase is used many times in Zechariah.

cut off the names of the idols from the land

AT: "erase idol worship throughout the land"

and also I will cause the false prophets and their unclean spirit to go out of the land

AT: "I will remove the false prophets and their impure spirits from the land"