The phrase ‘sons and daughters’ in 2 Cor 6.18 provides the only instance of θυγάτηρ in all of the letters ascribed to Paul. It is argued that (1) the OT allusions in vv. 16–18 are from similar contexts of warning against combining the worship and service of God with that given to other gods, with (2) v. 18 being an echo of Deut 32.19, another instance of Paul's use of Deut 32. (3) Another influence is the OT practice, unlike that of the NT, of predominantly using both ‘sons’ and ‘daughters’ in parenting and family contexts.