Midrash sa Mga Bilang 2:1: Sifra, Bamidbar Rabbah, Midrash Tanchuma Buber & Vayikra Rabbah

1) "And He called to Moses and the L–rd spoke to him, etc." "to him" — to exclude Aaron. R. Yehudah b. Betheira said: Thirteen dibroth (accompanied by a command) were stated in the Torah to Moses and Aaron, and, corresponding to them, thirteen limitations, to teach us that they were not spoken to Aaron, but to Moses, to tell them to Aaron. (The dibroth: 1) [Shemoth 6:13]; 2) [Shemoth 7:8]; 3) [Shemoth 9:8]; 4) [Shemoth 12:1]; 5) [Shemoth 12:43]; 6) [Vayikra 11:1]; 7) [Vayikra 13:1]; 8) [Vayikra 14:33]; 9 [Vayikra 15:1]; 10 [Bamidbar 2:1]; 11 [Bamidbar 4:1]; 12 [Bamidbar 4:18]; 13) [Bamidbar 19:2].)

“The Lord spoke to Moses and to Aaron, saying” (Numbers 2:1).
“The Lord spoke to Moses and to Aaron, saying.” In eighteen places you find Moses and Aaron as equals, corresponding to the eighteen blessings. The three patriarchs, from there you find a fixed obligation that one prays three times daily. Abraham instituted the morning prayer, as it is stated: “Abraham arose early in the morning [to the place where he had stood before the Lord]” (Genesis 19:27). Standing is nothing other than prayer, as it is stated: “Pinḥas stood and prayed” (Psalms 106:30). Isaac instituted the afternoon prayer, as it is stated: “Isaac went out to stroll [lasuaḥ]” (Genesis 24:63). Siḥa is nothing other than prayer, as it is stated: “The prayer of a poor man when he is faint [and pours out his plea [siḥo] before the Lord]” (Psalms 102:1). Jacob instituted the evening prayer, as it is stated: “He encountered [vayifga] the place…” (Genesis 28:11). Pegia is nothing other than prayer, as it is stated: “And you, do not pray on behalf of this people…[and do not plead [tifga] with Me]” (Jeremiah 7:16). In eighteen places Moses and Aaron are paired.
An allusion to the eighteen blessings; they correspond to the eighteen mentions of God’s name that are written in Shema Yisrael and in: “A psalm by David. Give to the Lord, sons of the mighty” (Psalms 29:1). The three patriarchs instituted that one prays three times daily, and Moses and Aaron [are paired in eighteen places], and from these eighteen mentions of God’s name we derived eighteen blessings.

(Numb. 2:1-2:) THEN THE LORD SPOKE UNTO MOSES AND UNTO AARON, SAYING: <THE CHILDREN OF ISRAEL SHALL CAMP,> EACH WITH HIS STANDARD, UNDER THE BANNERS FOR THEIR FATHERS' HOUSES…. Let our master instruct us: Within how many cubits is it permitted for one to walk on the Sabbath? Thus have our masters taught: One who observes the Sabbath on the road makes a circle with a radius of four cubits for himself.⁵³Tanh., Numb. 1:9; Numb. R. 2:9; cf.‘Eruv. 4:5-8. <These are> the words of R. Haninya ben Antigonus. Then he moves <objects> on the Sabbath <to> within within four cubits and says: My Sabbath rest is in this place where I am. So his place gives him the right <to go> two thousand cubits in any direction. But how much are four cubits? R. Judah says: Enough for him to take a cask from his feet and put it by his headrest. And one who keeps the Sabbath in a city, even though it is as large as Antioch, may walk all of it, its outskirts, and two thousand cubits beyond its outskirts.⁵⁴‘Eruv. 60a. What is the meaning of "outskirts"? The shops and the inns⁵⁵Gk.: pandokeia. which are on the road outside the city. And the one who keeps the Sabbath in a cave, even though it is as large as the cave where king Zedekiah of Judah fled,⁵⁶Zedekiah’s flight to a cave (me‘arah) may have been suggested by Jer. 52:7, according to which he fled for the Arabah. which was twelve miles⁵⁷Lat.: mille. long,⁵⁸Cf. Numb. R. 2:9, according to which the cave was eighteen miles long. may walk all of it and outside of it for two thousand cubits in any direction he wishes. And from where did the sages find support? From the words of Torah, [where it is stated] (in Numb. 35:5): AND YOU SHALL MEASURE OFF TWO THOUSAND CUBITS OUTSIDE THE TOWN ON THE EAST SIDE…. And likewise you find in the case of Joshua, when he went to destroy Jericho, Joshua said to them (i.e., to Israel): You are going to keep the Sabbath there. Do not go further than two thousand cubits from the ark in any direction. Why? So that you may be entitled to come to pray before the ark on the Sabbath. And so it says (in Joshua 3:4): YET THERE SHALL BE A DISTANCE BETWEEN YOU AND IT (the Ark of the Covenant) OF ABOUT TWO THOUSAND CUBITS BY MEASURE. And likewise you find, when God told Moses that he should have Israel encamp under standards, he said to him: Have them encamp under their standards in every direction. Where is it shown? From what is they read on the matter (in Numb. 2:2): <THE CHILDREN OF ISRAEL> SHALL CAMP, EACH WITH HIS STANDARD, UNDER THE BANNERS FOR THEIR FATHERS' HOUSE; <THEY SHALL CAMP AROUND THE TENT OF MEETING AT A DISTANCES>.⁵⁹Numb. R. 2:9 explains further that Gen. 21:16 defines AT A DISTANCE as a bowshot, which is equivalent to a Roman mile (i.e., a thousand paces), which equals two thousand cubits.