Sha-alu Shalom Yarushalyim T-Shirt
It means "Pray For The Peace of Jerusalem"
Tehillim 122:6-8Orthodox Jewish Bible (OJB)
6 Sha’alu shalom Yerushalayim (pray for the peace of Jerusalem); they shall prosper that love thee.
7 Shalom be within thy wall, and security within thy citadels.
8 L’ma’an (for the sake of) my achim and companions, I will now say, Shalom be within thee.