When the witness does not reside in the Philippines.
Section 633
SEC. 633. When the witness does not reside in the Philippines. — If none of the subscribing witnesses reside in the Philippine Islands at the time of the death of the testator, the court may admit the testimony of other witnesses to prove the sanity of the testator, and the due execution of the will, although the subscribing witnesses are living; and as evidence of the execution of the will, it may admit proof of the handwriting of the testator and of the subscribing witnesses, in cases where the names of the witnesses are subscribed to a certificate stating that the will was executed as required in this chapter. In case one or more of the subscribing witnesses has deceased, the sanity of the testator and the due execution of the will may also be proven in the manner in this section heretofore provided.