"To swear the affidavit" means to declare under oath or to make a solemn promise that the information contained in the affidavit (a written statement of facts) is true and accurate. Full definition
First, she had a law clerk swear an affidavit, saying that the clerk had reviewed all of the pictures and saw no pictures of the nature sought by the defendant. (slaw.ca)
The affidavit evidence tendered by the defendants made it apparent to the motions judge that the process server was untruthful in swearing his affidavits of service. (slaw.ca)
To get a Court order, the landlord must swear an affidavit stating the date that the premises were vacated by the original tenant and, if the landlord knows the reasons, why the non-tenant occupant refuses to leave the premises. (slsedmonton.com)