It was narrated that Ibn ‘Abbas (رضي الله عنه) disliked unripe dates (busr) on their own and he used to say:

The Messenger of Allah (ﷺ)forbade muzza’ (nabeedh made in green glazed pitchers or varnished jars) to the delegation of ‘Abdul Qais, and I am afraid that it may refer to unripe dates (busr).