מדרש על בראשית 13:1

After her death, Abraham aged rapidly, for it is written: And Abraham was old, and it is also written: The hoary head is a crown of glory (Prov. 16:31). Why was this crown of glory bestowed upon Abraham? Because he performed acts of charity. Therefore, it is written: And Abraham was old. The Holy One, blessed be He, said to him: It is sufficient for a servant to be like his master. This may be compared to a king who has a dear friend, to whom he says: “What present can I give You? You have silver, gold, male servants, handmaidens, fields, and vineyards. I will give you the crown that is on my head, and place it upon your head.” Similarly, the Holy One, blessed be He, said to Abraham: Silver and gold I have given thee, as it is said: And Abram was very rich in cattle, in silver, and in gold (Gen. 13:1); now what can I give you beside the crown that is on My head? When Daniel beheld him, he said: And the hair of his head like pure wool (Dan. 7:9). And therefore it is written: And Abraham was old, and well stricken in age (Gen. 24:1).

And in the morning the king sent for Abram, and he said unto him: What is it that thou hast ‎done unto me? Why hast thou said, she is my sister, and I therefore took her for a wife unto ‎me, and thus thou hast brought over me and my household a great plague? And now, behold ‎she is thy wife, take her then and go and depart from our land, lest we die all on thy account. ‎And Pharaoh took again sheep, and man servants and maid-servants and silver and gold and ‎gave them unto Abram, and he restored unto Abram Sarai his wife. And the king took a ‎maiden, which was born unto him by one of his concubines, and he gave her unto Sarai for a ‎maid-servant. And the king said unto his daughter: It is much better to be a servant in the ‎house of this woman than to be a mistress in my house, after we have seen what plague hath ‎befallen us on account of that woman. And Abram arose and went away from the land of ‎Egypt, he and all belonging to him. And Pharaoh ordered several men to accompany Abram ‎and all belonging unto him, and Abram returned unto the land of Canaan to the place of the ‎altar that he had built where he had put up his tent the first time. And Lot the son of Haran, ‎Abram’s brother, he too had a great number of flocks and herds and tents, for the Lord hath ‎done well with him for the sake of Abram. And when Abram dwelt in the land there was a ‎strife between the herdsmen of Abram’s cattle and between the herdsmen of Lot's cattle. ‎And the land was not able to bear them, that they might dwell together; for their substance ‎was great, and they could not dwell together in the land on account of their cattle. And the ‎herdsmen of Abram, whenever they went to graze their cattle, would be very careful not to ‎trespass upon fields of the inhabitants of the land. But the herdsmen of Lot would not do so, ‎and they drove the cattle to feed upon the fields of the inhabitants of the land, and the ‎people seeing those things day after day, came unto Abram and they quarreled with him on ‎account of the herdsmen of Lot. And Abram said unto Lot: What is it that thou art doing unto ‎me, to make me despised among the inhabitants of the land, by allowing thy herdsmen to ‎graze thy cattle in the fields of other people? Knowest thou not that I am a stranger in the ‎midst of the sons of Canaan, and wherefore dost thou treat them in such a manner? And ‎Abram was arguing with Lot concerning these things day after day, yet Lot would not hearken ‎unto his voice, but continued to do as theretofore, and the people of the land always came ‎with their complaints unto Abram. And Abram said unto Lot: How long wilt thou be unto me a ‎snare with the inhabitants of the land? Let there not be a strife between me and between ‎thee for are we not kinsmen? Separate thyself, I pray thee, from me; select for thyself a ‎dwelling place to dwell therein thou and thy cattle and all belonging unto thee, so that thou be ‎apart from me together with thy household. And fear thou not to separate from me, for even ‎if thou be away from me I will avenge the wrongs that anybody may inflict upon thee, as soon ‎as thou wilt inform me thereof.‎