Related Clues:

• 'What'll ___?'
• Solemn vow
• Vow words
• One fifth of an ABBA hit
• Solemn wedding words
• Rite answer?
• Court oath
• 'If ___ say so myself'
• '___ a Rock' (1966 hit)
• Altar affirmative
• Swearing-in pledge
• Existential declaration
• Start for a union?
• See 29-Across
• Common oath