Although the New Testament does not use the word Τριάς (Trinity) nor explicitly teach it, it provided the material upon which the doctrine of the Trinity was formulated.[17] Reflection by early Christians on passages such as the Great Commission: "Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit"[Matt 28:19] and Paul the Apostle's blessing: "The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all,"[2 Cor. 13:14] while at the same time the Jewish Shema Yisrael: "Hear, O Israel: the Lord our God, the Lord is one."[Deuteronomy 6:4][18] led the early Christians to question how the Father, Son, and Holy Spirit are "one". Later, the diverse references to God, Jesus, and the Spirit found in the New Testament were systematized into a Trinityone God subsisting in three persons and one substanceto combat heretical tendencies of how the three are related and to defend the church against charges of worshiping two or three gods.[19]