SEV Biblia, Chapter 3:12
Y él le respondió: Porque yo seré contigo; y esto te será por señal de que yo te he enviado: luego que hubieres sacado este pueblo de Egipto, serviréis a Dios sobre este monte.
Clarke's Bible Commentary - Exodus 3:12
Verse 12. Certainly I will be with thee] This great event shall not be left to thy wisdom and to thy power; my counsel shall direct thee, and my power shall bring all these mighty things to pass. And this shall be a token] Literally, And THIS to thee for a sign, i.e., this miraculous manifestation of the burning bush shall be a proof that I have sent thee; or, My being with thee, to encourage thy heart, strengthen thy hands, and enable thee to work miracles, shall be to thyself and to others the evidence of thy Divine mission.
Ye shall serve God upon this mountain.] This was not the sign, but God shows him, that in their return from Egypt they should take this mountain in their way, and should worship him in this place. There may be a prophetic allusion here to the giving of the law on Mount Sinai. As Moses received his commands here, so likewise should the Israelites receive theirs in the same place. After all, the Divine Being seems to testify a partial predilection for this mountain, for reasons that are not expressed. See's note on "ver. 5".
Matthew Henry Commentary
Verses 11-15 - Formerly Moses thought himself able to deliver Israel, and set himsel to the work too hastily. Now, when the fittest person on earth for it he knows his own weakness. This was the effect of more knowledge of God and of himself. Formerly, self-confidence mingled with strong faith an great zeal, now sinful distrust of God crept in under the garb of humility; so defective are the strongest graces and the best duties of the most eminent saints. But all objections are answered in, Certainl I will be with thee. That is enough. Two names God would now be know by. A name that denotes what he is in himself, I AM THAT I AM. Thi explains his name Jehovah, and signifies, 1. That he is self-existent he has his being of himself. 2. That he is eternal and unchangeable and always the same, yesterday, to-day, and for ever. 3. That he is incomprehensible; we cannot by searching find him out: this name check all bold and curious inquiries concerning God. 4. That he is faithfu and true to all his promises, unchangeable in his word as well as in his nature; let Israel know this, I AM hath sent me unto you. I am, an there is none else besides me. All else have their being from God, an are wholly dependent upon him. Also, here is a name that denotes what God is to his people. The Lord God of your fathers sent me unto you Moses must revive among them the religion of their fathers, which wa almost lost; and then they might expect the speedy performance of the promises made unto their fathers.
Original Hebrew
ויאמר 559 כי 3588 אהיה 1961 עמך 5973 וזה 2088 לך האות 226 כי 3588 אנכי 595 שׁלחתיך 7971 בהוציאך 3318 את 853 העם 5971 ממצרים 4714 תעבדון 5647 את 853 האלהים 430 על 5921 ההר 2022 הזה׃ 2088