Missouri Revised Statutes Title XXXI. Trusts and Estates of Decedents and Persons Under Disability § 474.450. Encumbrance does not revoke devise--exoneration, when

1. A charge or encumbrance upon any real or personal property, for the purpose of securing the payment of money or the performance of any covenant or agreement, is not deemed a revocation of any will, relating to the same property, previously executed.

2. When any property is specifically devised and at the time of the testator's death is subject to a mortgage, pledge, or other lien created prior to the execution of the will or created by a mortgage, pledge, or other lien executed after the execution of the will as a renewal, or extension, or refinancing of the debt created prior to the execution of the will, the devisee shall take the property so devised subject to the charge or encumbrance unless the will provides expressly or by necessary implication that such mortgage be otherwise paid, but if the mortgage, pledge or other lien was created after the execution of the will the devisee shall take the property exonerated from the encumbrance unless it appears from the terms of the loan agreement or from the circumstances surrounding the loan transaction that the testator intended that the encumbrance should be paid out of the encumbered property rather than from his general estate.