He must have forgotten about the Seventh and Eighth Commandments — thou shall not steal and thou shall not bear false witness.

A former employee of the Archdiocese of New York was sentenced yesterday to 51 months behind bars for embezzling nearly $250,000 while overseeing construction work on two Catholic schools in The Bronx.

David Murphy’s sacrilegious scam skimmed federal funds from a $10 million project to soundproof the St. Anselm and St. Athanasius elementary schools, both of which sit in a La Guardia Airport flight path.

Manhattan federal Judge Richard Sullivan said Murphy compounded his crimes — which also included lying to investigators — with “scandalous” and “libelous” claims that church officials had set him up.