After watching The Prince of Egypt, I saw these 3 lines appearing on the screen:
Looks like very important lines to the movie, then why it appeared at very end of closing credits?
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It is meant to point out that Moses is recognized as a prophet in the religious writings of three major world religions.
Given the conflict and waging of holy wars through out history by these three religious groups, I believe the purpose of including these was to show that these religions are based in the same roots and have much in common. An appeal for peace and finding common ground if you will.
EDIT: I'm not sure if your question was specifically why the quotes appeared at the end of the credits as opposed to earlier, or if the question was what the significance was of the three quotes.