“God Rest Ye Merry, Gentlemen” is one of the oldest extant English carols. It dates to at least the 16th century. Note the punctuation — the placement of the comma means that “merry” is an adverb modifying “rest,” not an adjective for “gentlemen.” Perhaps this grammar confusion derives from Dicken’s words in A Christmas Carol: “… at the first sound of ‘God bless you, merry gentlemen! May nothing you dismay!’, Scrooge seized the ruler with such energy of action that the singer fled in terror, leaving the keyhole to the fog and even more congenial frost.”

God rest ye merry, gentlemen
Let nothing you dismay
Remember, Christ, our Saviour
Was born on Christmas day
To save us all from Satan’s power
When we were gone astray
O tidings of comfort and joy,
Comfort and joy
O tidings of comfort and joy

In Bethlehem, in Israel,
This blessed Babe was born
And laid within a manger
Upon this blessed morn
The which His Mother Mary
Did nothing take in scorn
O tidings of comfort and joy,
Comfort and joy
O tidings of comfort and joy

From God our Heavenly Father
A blessed Angel came;
And unto certain Shepherds
Brought tidings of the same:
How that in Bethlehem was born
The Son of God by Name.
O tidings of comfort and joy,
Comfort and joy
O tidings of comfort and joy

“Fear not then,” said the Angel,
“Let nothing you affright,
This day is born a Saviour
Of a pure Virgin bright,
To free all those who trust in Him
From Satan’s power and might.”
O tidings of comfort and joy,
Comfort and joy
O tidings of comfort and joy

The shepherds at those tidings
Rejoiced much in mind,
And left their flocks a-feeding
In tempest, storm and wind:
And went to Bethlehem straightway
The Son of God to find.
O tidings of comfort and joy,
Comfort and joy
O tidings of comfort and joy

And when they came to Bethlehem
Where our dear Saviour lay,
They found Him in a manger,
Where oxen feed on hay;
His Mother Mary kneeling down,
Unto the Lord did pray.
O tidings of comfort and joy,
Comfort and joy
O tidings of comfort and joy

Now to the Lord sing praises,
All you within this place,
And with true love and brotherhood
Each other now embrace;
This holy tide of Christmas
All other doth deface.
O tidings of comfort and joy,
Comfort and joy
O tidings of comfort and joy