O ru, ru, ru, my little Jesu,
Ru, ru, ru, ru,
Close your eyes and slumber.
Be still all beasts, do not disturb His sleep,
Elephant, mosquito, do not make a sound!
O ru, ru, ru, my little Jesu,
Ru, ru, ru, ru,
Close your eyes in sleep.

O ru, ru, ru, ru, little Jesu,
Ru, ru, ru, ru, angels watch are keeping.
All men this night do hail Thee, little one;
Silently they kneel before Thee, Holy Child.
O ru, ru, ru, ru, my little Jesu,
Ru, ru, ru,ru, close your eyes in sleep.

abc | midi | pdf

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Source: Singing Together, Autumn 1977, BBC Publications

Notes:
As this is Mexican in origin, I do not know for certain if the original lyrics were English or Spanish. However, the lack of rhymes suggests that they were probably Spanish.

Roud:
Laws:
Child: