וַיִּקְרָא אֱלֹהִים לָאוֹר יוֹם וְלַחֹשֶׁךְ קָרָא לָיְלָה

וַיְהִי-עֶרֶב וַיְהִי-בֹקֶר יוֹם אֶחָד.

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وَدَعَا اللهُ النُّورَ نَهَارًا، وَالظُّلْمَةُ دَعَاهَا لَيْلاً.

وَكَانَ مَسَاءٌ وَكَانَ صَبَاحٌ يَوْمًا وَاحِدًا.

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Y llamó Dios á la luz Día, y á las tinieblas llamó Noche: y fué la tarde y la mañana un día.

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And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.

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Additional LDS scriptural sources:

Moses 2:5
And I, God, called the light Day; and the darkness, I called Night; and this I did by the word of my power, and it was done as I spake; and the evening and the morning were the first day.

Abraham 4:5
And the Gods called the light Day, and the darkness they called Night. And it came to pass that from the evening until morning they called night; and from the morning until the evening they called day; and this was the first, or the beginning, of that which they called day and night.