Some marriage vows are, "I promise to be true in good times and in bad, in sickness and in health," "Let us take the step for self-restraint and longevity," and "I promise to be faithful to you until death parts us." Each religion has its own version of marriage vows.
Marriage vows are sacred oaths husbands and wives make to one another. Each party makes a promise of devotion throughout the marriage. A standard Catholic vow is, "I take you for my lawful wife/husband, to have and to hold from this day forward, for better, for worse, for richer, for poorer, in sickness and health, until death do us part." Variations of this vow are common in other Christian denominations as well.
A standard Muslim vow is, "I pledge, in honesty and with sincerity, to be faithful and helpful." Normally a man makes this vow as a promise to support and care for his wife. Standard Hindu ceremonies have a slightly different vowing process in that the couple engages in the Seven Steps ritual. They go around a circle listing seven steps, or vows, that they promise for their marriage to work.
TheKnot.com lists vows from other religions and vows for non-religious marriage ceremonies.