"有句谚语说道" can be translated into English as "There is a saying that goes..." or "As the old saying goes...".
Both expressions are commonly used to introduce a proverb or traditional saying in English. For example:
There is a saying that goes, "A friend in need is a friend indeed."（有句谚语说道：“患难见真情。”）
As the old saying goes, "Early to bed and early to rise makes a man healthy, wealthy, and wise."（有句老话说得好：“早睡早起使人健康、富有且聪明。”）