Section 21

When any person dies or has died, having by his will, appointed any person to be his executor, the executor shall be deemed to be a trustee for the person, if any, who would be entitled to the estate in case the person died intestate in respect of any residue not expressly disposed of, unless it appears by the will that the person so appointed executor was intended to take the residue beneficially.

30 Laws of Malaysia Act 67