Hot answers tagged time
Let's call it "very strongly discouraged." If they were all-out prohibited, the Torah wouldn't have a procedure for them. There was a point when Jewish law would demand an oath in financial proceedings (e.g. "I was supposed to watch your cow and I swear I didn't abuse it in any way, it was hit by a lightning bolt"), but we try to avoid those today whenever ...
Only top voted, non community-wiki answers of a minimum length are eligible