Contradiction with 1 Samuel 16:14
1 Samuel 16:14 describes the Spirit of the Lord departing from Saul, which contradicts the blessing of the Spirit of the Lord being upon Jahaziel in 2 Chronicles 20:14.
1 Samuel 16:14: But the Spirit of the LORD departed from Saul, and an evil spirit from the LORD troubled him. [troubled: or, terrified]
Contradiction with Numbers 11:25
Numbers 11:25 states that the Spirit rested upon the elders temporarily, unlike the specific empowerment of Jahaziel in 2 Chronicles 20:14.
Numbers 11:25: And the LORD came down in a cloud, and spake unto him, and took of the spirit that [was] upon him, and gave [it] unto the seventy elders: and it came to pass, [that], when the spirit rested upon them, they prophesied, and did not cease.
Contradiction with 1 Kings 22:23
1 Kings 22:23 indicates that the Lord put a lying spirit in the mouths of prophets, contrasting the true message given by the Spirit in 2 Chronicles 20:14.
1 Kings 22:23: Now therefore, behold, the LORD hath put a lying spirit in the mouth of all these thy prophets, and the LORD hath spoken evil concerning thee.
Contradiction with Judges 16:20
Judges 16:20 shows Samson not realizing the Spirit had left him, opposing the clear anointing in 2 Chronicles 20:14.
Judges 16:20: And she said, The Philistines [be] upon thee, Samson. And he awoke out of his sleep, and said, I will go out as at other times before, and shake myself. And he wist not that the LORD was departed from him.
Contradiction with Psalm 51:11
Psalm 51:11 is David's plea not to have the Holy Spirit taken away, in contrast to the Spirit actively coming upon Jahaziel in 2 Chronicles 20:14.
Psalm 51:11: Cast me not away from thy presence; and take not thy holy spirit from me.