Isaiah 56:4

56:4 For thus saith the LORD unto the eunuchs that keep my sabbaths, and choose [the things] that please me, and take hold of my covenant;

Isaiah 58:13

58:13 If thou turn away thy foot from the sabbath, [from] doing thy pleasure on my holy day; and call the sabbath a delight, the holy of the LORD, honourable; and shalt honour him, not doing thine own ways, nor finding thine own pleasure, nor speaking [thine own] words: