The “theft” immediately meant is similar sacrilege to that complained of in Neh 13:10; Mal 3:8. They robbed God by neglecting to give Him His due in building His house, while they built their own houses, forswearing their obligations to Him; therefore, the “houses” they build shall be “consumed” with God’s “curse.” Probably literal theft and perjury accompanied their virtual theft and perjury as to the temple of God (Mal 3:5). Stealing and perjury go together; for the covetous and fraudulent perjure themselves by God’s name without scruple (see Pro 30:9).
enter ... the house - In vain they guard and shut themselves up who incur the curse; it will inevitably enter even when they think themselves most secure.
consume ... timber ... stones - not leaving a vestige of it. So the “stones” and “timber” of the house of a leper (type of the sinner) were to be utterly removed (Lev 14:15; compare 1Ki 18:38).