Deuteronomy 20:19-20

19“When you lay siege to a city for a long time, making war against it to capture it, you are not to destroy its trees by swinging an axe at them. For from them you may eat, so you shall not chop them down. For is the tree of the field human, that it should enter the siege before you?

20You may destroy and chop down only the trees that you know are not trees for food, so that you may build siege equipment against the city that is making war with you until its downfall.