Is there Impossible to God?

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This morning, after i took my brunch. I turned on my television and without expecting i accidentally watched the daily program of an certain religious group, which is called "The church of God" their pastor tell something about that what was really the "Impossible thing" that god cannot do? after hearing the rare thing, it made me interested. that's why i followed his teaching continuously and i figured out the answer very satisfied. How about you? can you guess what was that thing, that god cannot do. although we knew the fact the he was a powerful.