Vowed southwest will get valuable mineral

• Said some bad words
• ___ off (relinquished)
• Made a promise
• Used bad language
• Declared on a stack of Bibles
• Used foul language
• Prepared to testify
• Gave testimony
• Said a four-letter word

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Swore \Swore\, imp. of Swear .