Pretty much just gave it.
Deut. 18:10-12:
“There shall not be found among you any one that ... uses divination, or an observer of times, or an enchanter, or a witch, or a charmer, or a consulter with familiar spirits, or a wizard, or a necromancer, for all that do these things are an abomination unto the L-rd.”
I would also note In I Sam. 28, Saul went to fight the Philistines, but before doing so he went to visit the witch Ein Dor who divined.
She raised up the prophet Samuel, and, well, that went badly for Saul.
“or an observer of times”
What does this refer to? I have asked several people and never gotten a good answer.