SEV Biblia, Chapter 3:13
porque mío es todo primogénito; desde el día que yo maté todos los primogénitos en la tierra de Egipto, yo santifiqué para mí a todos los primogénitos en Israel, así de hombres como de animales; míos serán. Yo soy el SEÑOR.
John Gill's Bible Commentary
Ver. 13. Because all the firstborn [are] mine , etc.] Not merely in a general way, as all creatures are his, but in a special manner as his own, and that for the following reason: [for] on the day that I smote all the firstborn in the land of Egypt , I hallowed unto me all the firstborn in Israel, both man and beast ; that is, sanctified or set them apart as his own special property, or ordered the people of Israel so to do, ( Exodus 13:2); for as when he destroyed the firstborn of the Egyptians, he saved the firstborn of Israel, he had a special claim upon them as his; and though it was in the night when he destroyed the firstborn of Egypt, yet it was the night which preceded that day, and was a part of that day, even the fifteenth of Nisan, when the instructions were given to sanctify all the firstborn; though, as Aben Ezra observes, “day” signifies “time”, so that it was at or about the same time that the one and the other were done: mine they shall be ; this was declared when they were ordered to be sanctified to him, but now they were to be exchanged for the Levites: I [am] the Lord ; who have sovereign power to do as he would in claiming the firstborn, and then in exchanging them for the Levites, and appointing the Levites to minister to the priests, and serve in the tabernacle.
Matthew Henry Commentary
Verses 1-13 - There was much work belonging to the priests' office, and there wer now only Aaron and his two sons to do it; God appoints the Levites to attend them. Those whom God finds work for, he will find help for. The Levites were taken instead of the first-born. When He that made us saves us, as the first-born of Israel were saved, we are laid unde further obligations to serve him faithfully. God's right to us by redemption, confirms the right he has to us by creation.
Original Hebrew
כי 3588 לי כל 3605 בכור 1060 ביום 3117 הכתי 5221 כל 3605 בכור 1060 בארץ 776 מצרים 4714 הקדשׁתי 6942 לי כל 3605 בכור 1060 בישׂראל 3478 מאדם 120 עד 5704 בהמה 929 לי יהיו 1961 אני 589 יהוה׃ 3068