in spirit and in truth: In Greek, one preposition (a connecting word) is used for both words. This shows that spirit and truth form one united idea.
True worship happens when God’s Spirit makes God’s truth known to a person. Worship is not only about a place or a ceremony. It is about responding to God with the help of his Spirit and according to what is true about him.
Jesus himself is the Truth (14:6). The Spirit is also called the Spirit of truth (14:17; 15:26). Together, the Spirit and the Truth make true worship possible.