Tamar gave birth to twin sons, Perez and Zerah, both resembling their father in bravery and piety.[91] She called the first Perez, "mighty," because she said, "Thou didst show thyself of great power, and it is meet and proper that thou shouldst be strong, for thou art destined to possess the kingdom."[92] The second son was called Zerah, because he appeared from out of the womb before his brother, but he was forced back again to make way for Perez.[93] These two, Perez and Zerah. were sent out as spies by Joshua, and the line that Rahab bound in the window of her house as a token to the army of the Israelites, she received from Zerah. It was the scarlet thread that the midwife had bound upon his hand, to mark him as the child that appeared first and withdrew.[94] THE WIVES OF THE SONS OF JACOB Judah was the first of the sons of Jacob to enter wedlock. After the sale of Joseph to the Midianites, his brethren had said to Judah, "If conditions were as before, our father would provide wives for us now. As it is, he is entirely absorbed by his grief for Joseph, and we must look about for wives ourselves. Thou art our chief, and thou shouldst marry first." Judah's marriage with Alit the daughter of the noble merchant Shua, which was consummated at Adullam, the residence of his friend Hirah, or, as he was called later, Hiram, king of Tyre, was not happy. His two oldest sons died, and shortly thereafter his wife also. It was Judah's punishment for having begun a good deed and left it unfinished, for "he who begins a good deed, and does not execute it to the end, brings down misfortune upon his own head." Judah had rescued Joseph from death, but it was his suggestion to sell him into slavery. Had he urged them to restore the lad to his father, his brethren would have obeyed his words. He was lacking in constancy to persist until he had completed the work of Joseph's deliverance, which he had begun.[95]