NET
15 in case I am delayed, to let you know how people ought to conduct themselves in the household of God, because it is the church of the living God, the support and bulwark of the truth.
Darby
15 but if I delay, in order that thou mayest know how one ought to conduct oneself in God's house, which is [the] assembly of [the] living God, [the] pillar and base of the truth.
KJV
15 But if I tarry long, that thou mayest know how thou oughtest to behave thyself in the house of God, which is the church of the living God, the pillar and ground of the truth.