Matthew 9:15
Jesus said to them, "Can the groomsmen act sadly while the groom is still with them? But the time will come when the groom will be taken away from them, and then they will fast.
1 Corinthians 7:5
Do not deprive each other [of these marital rights], except by mutual agreement, so that you can spend the time in prayer. Then resume [normal sexual] relations again, so Satan is not able to tempt you [i.e., to have an affair] because of your lack of self-control.
James 4:8-10
Come close to God and He will come close to you. Wash your hands, you sinful people [i.e., this is an exhortation to repent of moral and spiritual corruption], and purify your hearts, you double-minded people.