About Ovadia Yosef:
Ovadia Yosef was a Talmudic scholar, an authority on Jewish religious law (halakha), and the longtime spiritual leader of Israel's ultra-orthodox Shas party. Born in Iraq, he was the Sephardi Chief Rabbi of Israel from 1973 to 1983. Yosef's responsa (religious law rulings) were highly regarded within Haredi circles, particularly among Mizrahi communities, among whom he was regarded as "the most important living halakhic authority."
You must not lean on a tree on Sabbath, if the tree might be dependent on you for support.
Ovadia Yosef