Egyptian Arabic translation?

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Hello Mylotters, I would love someone forever if they could help me with something I want to write and give to a friend in Egypt. He did me a good favour so I wish to send a small gift in thanks. The gift will hopefully be of benefit to his children as well. I want to translate the following words into Egyptian Arabic, or the correct dialect for the statement. "A stone cast to Earth from heaven, by the hand of God/Allah." But, I need it in written form. If anyone knows how I can find this all out, please help.