For the worship of God alone (against the invocation of saints and the worship of creatures), the orthodox saints is rejected contend: First, with express command of God by which by Exod. 20:3 and he forbids having any other gods before himself—“thou shalt have no other gods before me” or as the Septuagint has it “besides me.” Here the Lord decrees that nothing should be religiously worshipped except himself, the alone and supreme God. For that is said to be God to us and to be regarded as God whatever we adore and serve with religious worship, whatever that may be otherwise, either in itself or with us—namely because we transfer to it the honor which belongs to God alone. This is confirmed by Christ disputing against Satan: “Thou shalt worship the Lord thy God, and him only shalt thou serve” (Mt. 4:10). Now although the exclusive particle “alone” does not occur in Deut. 6:13 and 10:20 (whence the quotation is made), yet necessarily from the nature of the thing it is included (as it is expressed in 1 Sam. 7:3, “serve him only”). And if there was no other reason, the expression of the Savior is sufficient for us to conclude that religious worship must be paid to God alone..
Source: Francis Turretin, Institutes of Elenctic Theology (Vol. 2), 42.