Portray a biblical scene based on Exodus 9:8 where a figure resembling Moses and another figure resembling Aaron, respectfully shown in non-specific attire, stand near a furnace. Both figures have handfuls of ashes that are being sprinkled towards the heavens, creating a cascade of dust that moves upward, capturing a spiritual sentiment. Create this scene in the style of expressionism, emphasising the emotional experience in the colors, distortion, and dramatic elements. The artwork should respectfully reflect Christian devotional themes without the use of text or words.