Exhibit 5.1
CONSENT OF INDEPENDENT ACCOUNTANTS
The Sponsors and Trustee of
Defined Asset Funds--Municipal Investment Trust Fund--Insured Series--191
We consent to the use in this Post-Effective Amendment No. 7 to Registration
Statement No. 33-49447 of our opinion dated June 23, 2000 appearing in the
Prospectus, which is part of such Registration Statement, and to the reference
to us under the heading "How The Fund Works--Auditors" in such Prospectus.
DELOITTE & TOUCHE LLP
New York, N.Y.
July 12, 2000
