Leviticus 18:5

'ושמרתם את חקתי וגו‎ YE SHALL THEREFORE KEEP MY ORDINANCES — [This is not a mere repetition of v. 4 but is intended] to include other details of the laws mentioned in this chapter which Scripture does not expressly mention. Another explanation is: Scripture makes this repetition in order to attach the commands of “observing" (שמירה) and "performing" (עשיה) to the חוקים, and the commands of שמירה and עשיה to the משפטים, for in v. 4 it uses the term עשיה only in connection with the משפטים, and that of שמירה only with reference to the חוקים (Sifra, Acharei Mot, Section 8 10). וחי בהם means, THAT HE SHALL LIVE THROUGH THEM in the world to come (eternal life). For if you say it means that he shall live in this world, is it not a fact that in the end he must die! (Sifra, Acharei Mot, Section 8 10; cf. also Targ. Onkelos) 'אני ה‎ I AM THE LORD, Who am faithful to pay you your reward (Sifra, Acharei Mot, Section 8 10).

וּשְׁמַרְתֶּ֤ם אֶת־חֻקֹּתַי֙ וְאֶת־מִשְׁפָּטַ֔י אֲשֶׁ֨ר יַעֲשֶׂ֥ה אֹתָ֛ם הָאָדָ֖ם וָחַ֣י בָּהֶ֑ם אֲנִ֖י יְהֹוָֽה׃ {ס}        

You shall therefore keep my statutes, and my judgments: which if a man do, he shall live in them: I am the Lord.