14 Then he made curtains of goats’ hair for a tent over the tabernacle; he made eleven curtains [ak]in all. 15 The length of each curtain was thirty cubits and four cubits the width of each curtain; the eleven curtains had [al]the same measurements. 16 He [am]joined five curtains by themselves and the other six curtains by themselves. 17 Moreover, he made fifty loops on the edge of the curtain that was outermost in the first [an]set, and he made fifty loops on the edge of the curtain that was outermost in the second [ao]set. 18 He made fifty clasps of [ap]bronze to [aq]join the tent together so that it would be [ar]a unit. 19 He made a covering for the tent of rams’ skins [as]dyed red, and a covering of porpoise skins above.
When we do something for God, it should never be halfway, or skimpy, or under par. When they built the tabernacle, they gave it not just one, but four different coverings. It probably seemed a little silly to them, but God asked for four coverings. They could have just done the linen, since that was the most beautiful, and the porpoise skins certainly would not have been very nice to see from the outside. But they followed God’s directions and did things to completion.
It also reminds me a bit that God looks on the inside (of the human heart) while man only looks on the outward appearance. God knew there were four layers there, all with a purpose, while the common man would have only seen the outer layer and considered it unfit for a holy deity.