Historical clue formulations

• Make certain — 2022-12-25
• Guarantee — 2020-04-20
• Pledge to — 2019-08-02
• Guarantee — 2019-05-20
• Guarantee — 2018-04-16
• Dispel the doubts of — 2015-09-17
• Give one's word — 2013-08-27
• Guarantee — 2011-12-20
• "This I ___ you ..." — 2011-12-13
• Guarantee — 2006-07-04
• Guarantee — 2004-12-02
• State confidently to — 2004-10-11
• Free from doubt — 2002-11-30
• Make certain — 2002-08-07
• State confidently — 2001-12-11
• Give confidence to — 2001-08-07
• Give confidence to — 2001-05-23
• Hearten — 2001-02-08
• Give confidence to — 2000-12-20
• Guarantee — 2000-09-06
• Give one's word — 1999-07-24
• Underwrite — 1997-11-06
• Guarantee — 1997-05-20
• Guarantee — 1995-05-02
• Give confidence to — 1994-12-29
• Guarantee — 1994-09-06