30 You shall keep my Sabbaths and reverence my sanctuary: I am the Lord.
31 “Do not turn to mediums or necromancers; do not seek them out, and so make yourselves unclean by them: I am the Lord your God.
32 “You shall stand up before the gray head and honor the face of an old man, and you shall fear your God: I am the Lord.
33 “When a stranger sojourns with you in your land, you shall not do him wrong. 34 You shall treat the stranger who sojourns with you as the native among you, and you shall love him as yourself, for you were strangers in the land of Egypt: I am the Lord your God. (ESV)
7 If even lifeless instruments, such as the flute or the harp, do not give distinct notes, how will anyone know what is played? 8 And if the bugle gives an indistinct sound, who will get ready for battle? 9 So with yourselves, if with your tongue you utter speech that is not intelligible, how will anyone know what is said? For you will be speaking into the air. 10 There are doubtless many different languages in the world, and none is without meaning, 11 but if I do not know the meaning of the language, I will be a foreigner to the speaker and the speaker a foreigner to me. 12 So with yourselves, since you are eager for manifestations of the Spirit, strive to excel in building up the church. (ESV)