The Great Jurist of Madinah, Imam Sa’id ibn al-Musayyib {Allah send His Divine Mercy upon him} said:
The first one to establish the {Hijri} calendar was ‘Umar ibn al-Khattab {Allah be pleased with him} two and a half years into his caliphate. He reached a decision in consultation with ‘Ali Ibn Abi Talib {Allah be well pleased with him}
{Tarikh al-Islam ~ The History of Islam by Imam ad-Dhahabi}
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