There are a variety of concepts and verbs that are used when expressing a sort of relationship with God: Does one pray, worship, serve God? How does one address God and which titles can be used? Where does one worship and serve God? How does one express sacrificing? What verbs and concepts are used to indicate mourning? All these key-concepts and verbs are analysed in this volume. Whereas the focus of this volume is on the Greek Biblical, Septuagintal text, these concepts and verbs are also traced from the Hebrew Bible, via the Greek Old Testament, and further into the New Testament and the patristic literature.