Numbers 22:18 KJV
And Balaam answered and said unto the servants of Balak, If Balak would give me his house full of silver and gold, I cannot go beyond the word of the Lord my God, to do less or more.
Numbers 22:18, King James Version
In context
17 For I will promote thee unto very great honour, and I will do whatsoever thou sayest unto me: come therefore, I pray thee, curse me this people.
18 And Balaam answered and said unto the servants of Balak, If Balak would give me his house full of silver and gold, I cannot go beyond the word of the Lord my God, to do less or more.
19 Now therefore, I pray you, tarry ye also here this night, that I may know what the Lord will say unto me more.