Deuteronomy 16:21
Thou shalt not plant thee a grove of any trees near unto the altar of the Lord thy God, which thou shalt make thee.
Cross-reference
Exodus 34:13 commands tearing down Asherah poles — reinforcing the prohibition against planting them beside God's altar.
Judges 3:7 records Israel serving Asheroth — the very sin Deuteronomy forbids, showing their disobedience to this command.
1 Kings 16:33 records Ahab making an Asherah — a blatant violation of Deuteronomy 16:21's command not to plant one.
In 2 Kings 17:16, Israel's making an Asherah directly violates this prohibition against planting an Asherah beside God's altar.
2 Kings 21:3 shows King Manasseh making an Asherah, exemplifying the very practice forbidden here.
2 Chronicles 33:3 describes Manasseh making Asheroth, a direct violation of this command.
Leviticus 26:1 also forbids pillars and images, reinforcing the same ban on pagan worship symbols.
2 Kings 17:10 records Israel setting up Asherim on high hills, directly acting against this command.