B'inyan Dibbuk Al Yedei Devek Ee Havei K'chibur L'inyan Ohr Echad Shel Tefilin V'oid Dinim (Teshuvos RA''E Siman 11); Ktzas B'parshas Lech Lecha V'parshas Vayeira

From Teshuvos Rebbe Akiva Eiger by R Yaakov Moishe Shurkin.