'Obey My Voice' in the Bible

But I only commanded them this word, {saying}, 'Obey my voice, and I will be to you God, and you will be to me people, and you must walk in all of the way that I command you, so that it goes well with you.'

for I solemnly admonished your ancestors in the day of my leading them out from the land of Egypt and up to this day, {admonishing persistently}, {saying}, "Obey my voice."