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Sylvia atricapilla
"It has mainly olive-grey upperparts and pale grey underparts, and differences between the five subspecies are small. Both sexes have a neat coloured cap to the head, black in the male and reddish-brown in the female." ~wiki
in a tamarisk tree in a desert mountain wadi with a lot of vegetation
Thanks so much for the ID, Daniele! Confirmed that they do pass through Sinai. :-)
Hi Bernadette! Maybe a female Eurasian blackcap? They visit Egypt in the winter, but I'm not sure about the Sinai.