Savings is not unbiblical but worry is. When the Israelites gathered more Mana than they needed for one day, God was displeased. It signified that they did not trust God. They already had an issue of distrust. Whenever they faced any difficulty, they grumbled against Moses. This daily provision was much beyond provision. It was a daily lesson of God’s ability to take care is them.
Worry signifies distrust in God to take care of us.
See Exodus 16.
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