ation ▁may ▁be ▁made ▁in ▁Wel sh , ▁G ael ic , ▁Corn ish ▁or ▁English . ▁ ▁United ▁States ▁The ▁original ▁ 1 7 8 7 ▁text ▁of ▁the ▁Constitution ▁of ▁the ▁United ▁States ▁makes ▁three ▁references ▁to ▁an ▁" o ath ▁or ▁aff irm ation ": ▁In ▁Article ▁I , ▁Sen ators ▁must ▁take ▁a ▁special ▁o ath ▁or ▁aff irm ation ▁for ▁the ▁purpose ▁of ▁sitting ▁as ▁the ▁trib unal ▁for ▁im pe achment ; ▁in ▁Article ▁II , ▁the ▁president ▁is ▁required ▁to ▁take ▁a ▁specified ▁o ath ▁or ▁aff irm ation ▁before ▁entering ▁office ▁( see ▁o ath ▁of ▁office ); ▁and ▁in ▁Article ▁VI , ▁all ▁state ▁and ▁federal ▁officials ▁must ▁take ▁an ▁o ath ▁or ▁aff irm ation ▁to ▁support ▁the ▁US ▁Constitution . ▁A ▁fourth ▁appears ▁in ▁Am end ment ▁IV , ▁all ▁war r ants ▁must ▁be ▁supported ▁by ▁evidence ▁given ▁under ▁o ath ▁or ▁aff irm ation . ▁ ▁On ▁Friday , ▁March ▁ 4 , ▁ 1 8 5 3 , ▁Franklin ▁Pier ce ▁became ▁the ▁ 1 4 th ▁President ▁of ▁the ▁United ▁States ▁and ▁has ▁been ▁the ▁only ▁president ▁to ▁date ▁who ▁aff ir med ▁rather ▁than ▁sw ore ▁to ▁the ▁o ath ▁of ▁office . ▁ ▁See ▁also ▁Perform ativity ▁ ▁Matthew ▁ 5 : 3 4 ▁▁▁ ▁O ath ▁of ▁Al leg iance ▁( Un ited ▁Kingdom ) ▁ ▁O ath ▁of ▁office ▁of ▁the ▁President ▁of ▁the ▁United ▁States ▁ ▁References ▁ ▁Category : O ath s