'Careful to Observe' in the Bible

And you shall hear, Israel, and be careful to observe [these instructions], so that {it may go well for you} and that you may multiply greatly, [just] as Yahweh, the God of your ancestors, {promised} you, [in] a land with milk and honey.

Only be very careful to observe the commandment and law that Moses Yahweh's servant commanded you, to love Yahweh your God, to walk in all his ways, to keep his commandments, to hold fast to him, and to serve him with all your heart and with all your soul."