Question: who purchased the land for masjid e nabwi
[{'answer': 'Muhammad', 'provenance': [{'wikipedia_id': '404782', 'title': 'Al-Masjid an-Nabawi', 'start_paragraph_id': 1, 'start_character': 115, 'end_paragraph_id': 1, 'end_character': 123, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '404782', 'title': 'Al-Masjid an-Nabawi', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 694, 'bleu_score': 0.828110670775376, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7729958130326366965}, 'section': 'Section::::History.:Early days.\n'}]}]