אֲשֶׁ֨ר עָשָׂ֥ה דָוִ֛ד אֶת־הַיָּשָׁ֖ר בְּעֵינֵ֣י יְהוָ֑ה וְלֹֽא־סָ֞ר מִכֹּ֣ל אֲשֶׁר־צִוָּ֗הוּ כֹּ֚ל יְמֵ֣י חַיָּ֔יו רַ֕ק בִּדְבַ֖ר אוּרִיָּ֥ה הַחִתִּֽי׃
Weil David getan hatte, was recht ist in den Augen des Herrn, und während seines ganzen Lebens nicht gewichen war von allem, was er ihm geboten, außer in der Sache des Hetiters Urija.
Tosefta Kilayim
A horse may not be tied to a mule, or a mule to a donkey, or a donkey to a wild ass, because this one may be driven with that one. If he [nonetheless] did so, Rabbi Meir holds him liable, and the Sages exempt him. Rabbi Yehuda says, the offspring of a female horse and the offspring of a female donkey are forbidden [to be tied] together, but the sages say, all mules are a single species. Assi the Babylonian says, it is forbidden to ride on the back of a mule, from a kol v'chomer: Just as where it is permitted to wear two cloaks on top of one another [even if one is made of wool and the other of linen], yet it is forbidden [to wear a single cloak] if it is of a forbidden mixture, thus where it is forbidden to drive two [diverse species] together, does it not all the more so stand to reason that a forbidden mixture of both them should be forbidden? They said to him, behold, it says (1 Kings 1:33, JPS tr.), "and have my son Solomon ride on my mule, and bring him down to Gihon." He said to them, one cannot derive [halacha] from [actions performed] in urgency. They said to him, it says [as to Solomon] (2 Kings 18:3), "He did what was correct in the eyes of God, like all that his father David had done, and [as to David] (1 Kings 15:5), "He never turned throughout his life from all that had been commanded him [except in the matter of Uriah the Hittite]."