Unexplained repetitions in Torah

Question

Nothing in the Torah is superfluous. So, when there are repetitions, our Sages explain why the repetition is necessary. But there is one very frequent instance where I could find no explanation for the repetition. We often read:

וַיְדַבֵּ֥ר יְהֹוָ֖ה אֶל־מֹשֶׁ֥ה לֵּאמֹֽר׃ or וַיֹּ֥אמֶר יְהֹוָ֖ה אֶל־מֹשֶׁ֥ה לֵּאמֹֽר

And the Lord said to Moses, saying: ___ [E.g.: Ex. 13:1, Numbers 13:1, 27:6, etc.]

Why the repetition "said" and "saying"?

This can't be explained by a quirk in biblical Hebrew, because in other places the phrase is straightforward, with no repetition, e.g., וַיֹּ֤אמֶר יְהֹוָה֙ אֶל־מֹשֶׁ֔ה -- and the Lord said to Moses [Ex. 34:1]

Answer 1

The Gemara in Yoma 4b explains one possible reason for this. I have copy/pasted from Sefaria, with Steinsaltz commentary in between:

״וַיִּקְרָא אֶל מֹשֶׁה וַיְדַבֵּר״, לָמָּה הִקְדִּים קְרִיאָה לְדִיבּוּר? לִימְּדָה תּוֹרָה דֶּרֶךְ אֶרֶץ, שֶׁלֹּא יֹאמַר אָדָם דָּבָר לַחֲבֵירוֹ אֶלָּא אִם כֵּן קוֹרֵהוּ. מְסַיַּיע לֵיהּ לְרַבִּי חֲנִינָא. דְּאָמַר רַבִּי חֲנִינָא: לֹא יֹאמַר אָדָם דָּבָר לַחֲבֵירוֹ אֶלָּא אִם כֵּן קוֹרֵהוּ. ״לֵאמֹר״, אָמַר רַבִּי (מוּסְיָא בַּר בְּרֵיהּ דְּרַבִּי מַסְיָא מִשְּׁמֵיהּ דְּרַבִּי מוּסְיָא) רַבָּה: מִנַּיִין לָאוֹמֵר דָּבָר לַחֲבֵירוֹ שֶׁהוּא בְּבַל יֹאמַר עַד שֶׁיֹּאמַר לוֹ: לֵךְ אֱמוֹר — שֶׁנֶּאֱמַר: ״וַיְדַבֵּר ה׳ אֵלָיו מֵאֹהֶל מוֹעֵד לֵאמֹר״.

The verse says: “And He called unto Moses, and the Lord spoke unto him from within the Tent of Meeting, saying” (Leviticus 1:1). Why does the verse mention calling before speaking, and God did not speak to him at the outset? The Torah is teaching etiquette: A person should not say anything to another unless he calls him first. This supports the opinion of Rabbi Ḥanina, as Rabbi Ḥanina said: A person should not say anything to another unless he calls him first. With regard to the term concluding the verse: “Saying,” Rabbi Musya, grandson of Rabbi Masya, said in the name of Rabbi Musya the Great: From where is it derived with regard to one who tells another some matter, that it is incumbent upon the latter not to say it to others until the former explicitly says to him: Go and tell others? As it is stated: “And the Lord spoke to him from within the Tent of Meeting, saying [lemor].”

In short: Hashem adds "lemor" at the end as a permission and instruction for Moshe to go ahead and pass on the information to the Jewish people.

Answer 2

This might or might not answer your question and is being written for someone who is into Torah codes.

If you are knowledgeable in mathematics/ statistics etc AND believe in the concept of the Torah codes, you will see that the redundancy that is present in words repeating themselves helps maintain the coded words in the text.