Abu-Bakr Al-Marwazee (rahimahullaah) said: I said to Abu Abdillaah [Imaam Ahmad (rahimahullaah)]: “Due to what reason did Sufyaan Ath-Thawree (rahimahullaah) depart to Yemen?!” He said: “He departed to (Yemen) for trade and to meet Ma’mar (rahimahullaah). They say that he had a hundred dinars,  but what is correct is seventy dinars.”

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[Al-Hath-thu Alaa At-Tijaarah Was-sinaa’ah. page:47]