'Flask' in the Bible

Now Elisha the prophet called for one of the sons of the prophets, and he said to him, "Gird your loins, and take this flask of olive oil in your hand, and go to Ramoth-Gilead.

You must take the flask of olive oil and pour it out on his head. You must say, 'Thus says Yahweh, "I hereby anoint you as king over Israel." ' Then you must open the door and flee; do not linger!"