KJV : And thou shalt keep <06213> (8804) the feast <02282> of weeks <07620> unto the LORD <03068> thy God <0430> with a tribute <04530> of a freewill offering <05071> of thine hand <03027>, which thou shalt give <05414> (8799) [unto the LORD thy God], according as the LORD <03068> thy God <0430> hath blessed <01288> (8762) thee: {a tribute: or, sufficiency}

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NASB : "Then you shall celebrate the Feast of Weeks to the LORD your God with a tribute of a freewill offering of your hand, which you shall give just as the LORD your God blesses you;

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NASB# : "Then you shall celebrate<6213> the Feast<2282> of Weeks<7620> to the LORD<3068> your God<430> with a tribute<4530> of a freewill<5071> offering<5071> of your hand<3027>, which<834> you shall give<5414> just<3512> as the LORD<3068> your God<430> blesses<1288> you;