King James Version (KJV)
Only fear the LORD, and serve him in truth with all your heart: for consider how great {things} he hath done for you. {how...: or, what a great thing}
Modern English
Only fear Yahweh, and serve him in truth with all your heart; for consider what great things he has done for you.
Hebrew
אַ֣ךְ ׀ יְר֣אוּ אֶת־יְהוָ֗ה וַעֲבַדְתֶּ֥ם אֹת֛וֹ בֶּאֱמֶ֖ת בְּכָל־לְבַבְכֶ֑ם כִּ֣י רְא֔וּ אֵ֥ת אֲשֶׁר־הִגְדִּ֖ל עִמָּכֶֽם׃
ʾak ׀ yrʾv ʾet-yhvah vaʿabadtem ʾotvo beʾemet bkal-lbabkem kiy rʾv ʾet ʾasher-higdil ʿimakem