King James Version
And thou shalt keep the feast of weeks unto the LORD thy God with a tribute of a freewill offering of thine hand, which thou shalt give unto the LORD thy God, according as the LORD thy God hath blessed thee:English Standard Version
Then you shall keep the Feast of Weeks to the LORD your God with the tribute of a freewill offering from your hand, which you shall give as the LORD your God blesses you.New International Version
Then celebrate the Feast of Weeks to the LORD your God by giving a freewill offering in proportion to the blessings the LORD your God has given you.