Midrash sur La Genèse 25:1

And at that time Abraham again took a wife in his old age, from the land of Canaan, and her ‎name was Keturah; and she bare unto him: Zimran, and Jokshan, and Medan, and Midian, and ‎Ishbak, and Shuah—six sons. And the sons of Zimran were: Abihen, and Molech, and Marim. ‎And the sons of Jokshan were: Sheba and Dedan. And the sons of Medan were: Amido, and ‎Joab, and Gochi, and Elisha, and Notach. And the sons of Midian were: Ephah, and Epher, and ‎Chanoch, and Abi da, and Eldaah. And the sons of Ishbak were: Makiro, and Bejodua, and ‎Tator. And the sons of Shuah were: Bildad, and Mamdad, and Meman, and Mehan. All these ‎are the families of the children of Keturah, the Canaanitish woman, which she bare unto ‎Abraham, the Hebrew. And Abraham sent all of them away, giving them gifts, and they went ‎away from Isaac his son, to locate wheresoever they should find a suitable place; and they ‎went all unto the mountains eastward and they built unto themselves six cities and they dwelt ‎therein even unto this day. And the children of Shebah and Dedan, the sons of Jokshan, did ‎not dwell with their brethren in their cities, and they journeyed about camping in the countries ‎and in the deserts even unto this day; and the children of Midian, son of Abraham, went ‎eastward of the land of Cush, where they discovered a large valley in the country of the east, ‎and they located there and built a city, and they dwelt in it. That is the land of Midian unto this ‎day. And Midian dwelt in the city which he built, with his five sons and all belonging unto him; ‎and these are the names of Midian's sons, according to their names and their cities: Ephah, ‎and Epher, and Chanoch, and Abida, and Eldaah. And the sons of Ephah were: Methach, and ‎Meshar, and Avi, and Tzanua. And the sons of Epher were: Ephron, and Zur, and Alirun, and ‎Medin. And the sons of Chanoch were: Reuel, and Rekem, and Azi, and Alyoshub, and Alad. ‎And the sons of Abida were: Chur, and Melud, and Keruy, and Molchi. And the sons of Eldah ‎were: Miker, and Reba, and Malchiyah, and Gabol. These are the names of the Midianites ‎according to their families; and afterwards the families of Midian spread throughout the land ‎of Midian. And these are the families of Ishmael, the son of Abraham, whom Hagar, Sarah's ‎handmaid, bare unto Abraham. - - And Ishmael took a wife from the land of Egypt, and her ‎name was Ribah, the same is Meribah. And Ribah bare unto Ishmael: Nebayoth, and Kedar, ‎and Adbeel, and Mibsam, and their sister Bosmath. And Ishmael disowned his wife Ribah, and ‎she went from him and returned to Egypt to the house of her father, and she dwelt there, for ‎she had been very wicked in the sight of Ishmael, and in the sight of his father Abraham. And ‎Ishmael afterward took a wife from the land of Canaan, and her name was Malchuth, and she ‎bare unto him: Nishma, and Dumah, and Masa, and Chadad, and Tema, and Yetur, and ‎Naphish, and Kedma. These are the sons of Ishmael, and these are their names, twelve ‎princes according to their nations; and the families of Ishmael spread forth,

And Abraham took another wife (Gen. 25:1). May our master teach us: How many times should one pray each day? R. Samuel the son of Nahman declared: Since there are three periods in each day, a man should pray three times every day—in the morning, when the sun is in the east; at noon, when the sun is at its zenith; and in the afternoon, when the sun is in the west. R. Joshua the son of Levi stated: Abraham established the morning prayer, as it is said: And Abraham arose early in the morning (Gen. 22:3); Isaac instituted the afternoon prayer, as it is said: And Isaac went out to meditate in the field at eventide (ibid. 24:63); and Jacob introduced the evening prayer, as it is said: And he lighted upon the place and tarried there all night because the sun was setting (ibid. 28:1).

And Abraham took another wife (Gen. 25:1). Scripture states elsewhere: Though thy beginning was small, yet thy end shall greatly increase (Job 8:7). This verse alludes to Moses. R. Samuel the son of Nahman explained it as follows: For seven days the Holy One, blessed be He, endeavored to persuade Moses, from the midst of the burning bush, (to fulfill his duty), but he tried to avoid it, as it is said:: O Lord, send, I pray Thee, by the hand of him Thou wilt send (Exod. 4:13), and it is written: O Lord, I am not a man of words (ibid., v. 10), and it states elsewhere: And Moses hid his face (ibid. 3:6). Yet thy end shall greatly increase (Job 8:7). This verse refers to him, since it is written: The likeness of the Lord doth he behold (Num. 12:8). R. Simeon the son of Yohai was of the opinion that Moses beheld the likeness of the Holy One, blessed be he, as soon as the Holy One spoke to him out of the burning bush.