To clarify, God will show mercy upon the faithful by bringing justice upon the wicked:
15 For this people’s heart is waxed gross, and their ears are dull of hearing, and their eyes they have closed;
24 ¶ Another parable put he forth unto them, saying, The kingdom of heaven is likened unto a man which sowed good seed in his field:
25 But while men slept, his enemy came and sowed tares among the wheat, and went his way.
26 But when the blade was sprung up, and brought forth fruit, then appeared the tares also.
27 So the servants of the householder came and said unto him, Sir, didst not thou sow good seed in thy field? from whence then hath it tares?
28 He said unto them, An enemy hath done this. The servants said unto him, Wilt thou then that we go and gather them up?
29 But he said, Nay; lest while ye gather up the tares, ye root up also the wheat with them.
30 Let both grow together until the harvest: and in the time of harvest I will say to the reapers, Gather ye together first the tares, and bind them in bundles to burn them: but gather the wheat into my barn. (Matthew 13:24-30)
It’s okay to match these elements with what occurred in Egypt—the wicked in Egypt were reaped; the faithful inherited their wealth. This pattern repeated itself in other nations that the children of Israel passed—their wicked were reaped and the faithful inherited the wealth.