But if one is too poor to pay the assessment, he is to present the person before the priest and the priest will set a value for him. The priest will set a value for him according to what the one making the vow can afford.
He may not replace it or make a substitution for it, either good for bad, or bad for good. But if he does substitute one animal for another, both that animal and its substitute will be holy.
‘If someone offends by sinning unintentionally in regard to any of the Lord’s holy things, he must bring his penalty for guilt to the Lord: an unblemished ram from the flock (based on your assessment of its value in silver shekels, according to the sanctuary shekel ) as a guilt offering.
Do not let your mouth bring guilt on you, and do not say in the presence of the messenger that it was a mistake. Why should God be angry with your words and destroy the work of your hands?