Rif Brachot 6b

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6b

[One who does not say Emet VeYatziv {after the Shema}] in the morning, and Emet VeEmuna {after the Shema} in the evening, has not fulfilled his obligation.
What is the reason? It states in Tehillim 92:3:

ג לְהַגִּיד בַּבֹּקֶר חַסְדֶּךָ; וֶאֱמוּנָתְךָ, בַּלֵּילוֹת.

3 To declare Thy lovingkindness in the morning, and Thy faithfulness in the night seasons,

And Rabba bar Chanina Sava {the elder} cited Rav: One who prays {Shemoneh Esrei}, when he bows, he should bow at Baruch, and he straightens, he should straighten at at Name {of God}.

Shmuel said: What is the reason? It states in Tehillim 146:8:

ח ה, פֹּקֵחַ עִוְרִים--ה, זֹקֵף כְּפוּפִים; ה, אֹהֵב צַדִּיקִים.

8 The LORD openeth the eyes of the blind; the LORD raiseth up them that are bowed down; the LORD loveth the righteous;

{Brachot 12b}
Rav Sheshet, when he bowed, bowed like a reed, and when he straightened up, he straightened like a serpent.

And Rabba bar Chanina Sava {the elder} cited Rav: The entire year a man should pray haEl haKadosh {the holy God -- in the third blessing of Shemoneh Esrei} and melech oheiv tzedaka umishpat {king who loves righteousness and judgment -- in the eleveth blessing}, except in the ten days between Rosh HaShana and Yom Kippur, in which he prays haMelech haKadosh {the holy King} and haMelech haMishpat {the King of judgement}.

Rabbi Eleazar said: Even the ten days between Rosh HaShana and Yom Kippur, if he says haEl haKadosh and haEl haMishpat (!!) has fulfilled, as it states in Yeshaya 5:16:

טז וַיִּגְבַּהּ ה צְבָאוֹת, בַּמִּשְׁפָּט; וְהָאֵל, הַקָּדוֹשׁ, נִקְדָּשׁ, בִּצְדָקָה.

16 But the LORD of hosts is exalted through justice, and God the Holy One is sanctified through righteousness.

What do we say on this?
And we leave off with saying that the halacha is {is like Rabba and we say} haMelech haKadosh and haMelech haMishpat. And from the fact that we come out like this, we deduce that we do not hold like Rabbi Eleazar who says that if he says haEl haKadosh and haEl haMishpat has fulfilled...