Question: where did the expression pot calling the kettle black come from
[{'answer': 'Spanish', 'provenance': [{'wikipedia_id': '6516933', 'title': 'The pot calling the kettle black', 'start_paragraph_id': 1, 'start_character': 72, 'end_paragraph_id': 1, 'end_character': 79, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6516933', 'title': 'The pot calling the kettle black', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 351, 'bleu_score': 0.783142029070786, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3726962846860033350}, 'section': 'Section::::Abstract.'}]}]