Responsa for Bava Batra 59:6

Q. A, a widow's trustee, leased half of the widow's house, for a term of ten years, to C, who, in turn, leased it to B. After B moved into the house, A became greatly dissatisfied with him and demanded that B move out of the house immediately, on the ground that he had leased the house to C, and therefore was under no obligation to B. He told B, however, that should C have any claims against him on account of the eviction of B, he, A, would answer these charges in court. B, however, claimed: that C rented the house from A on condition that he (C) lease it to whomever he wants; that he, B, was willing to partition off the part of the house he occupies from the rest of the house; and that he would guarantee to pay the widow for any damages she may sustain as a result of his remaining on the premises. A, however, claimed that he feared that grave damages to the widow will result if B stays, and that the widow cannot dwell in one house with a snake (meaning B).
A. Since A admits that C had the right to lease the house to anyone he pleased, A cannot evict B from the widow's house.
SOURCES: Cr. 259; Pr. 680; Mord. B. M. 357; Agudah B. M. 125. Cf. Hag. Maim. to Sekirut 5, 20; Weil, Responsa 10.