Sahih Bukhari

Narrated Sa`id bin Jubair:A Jew from Hira asked me which one of the two periods Musa (i.e. Prophet Moses) completed. I said, ""I don't know, (but wait) till I see the most learned 'Arab and inquire him about it."" So, I went to Ibn `Abbas and asked him. He replied, ""Moses completed the longer and better period."" Ibn `Abbas added, ""No doubt, an apostle of Allah always does what he says