Jews around the world began celebrating Passover on Friday night, and Israelis commemorated the deliverance of the ancient Hebrews from Egypt by opening their homes to newly arrived Soviet immigrants. This year's holiday holds special significance for about 210,000 of the Soviet newcomers, who are celebrating their first Passover in the Jewish state. Jews in the Soviet Union, meanwhile, stood in long lines early Friday outside Moscow's main synagogue waiting to buy matzo, the unleavened wafers eaten by Jews during Passover. Unlike a few years ago, when religious observance was suppressed, the Soviet government allocated 170 tons of flour to the synagogue to bake matzo this year.