This is the last word of the first line of Ma'oz Tzur.
I've always sung leshabe'ah but wouldn't this require a yud between the Bet and Chet?
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aaron, welcome to Mi Yodeya, and thanks for bringing your question here! I recommend taking a look at our Beginner's Guide to Mi Yodeya.– Isaac Moses ♦Dec 28, 2016 at 15:53