" ... all..." and also a G missing (over "... Satan's ..."), after which the B7 
is correct (over ... "pow'r").  Also, I re-spaced some of the chord changes, 
particularly in the Refrain, so that those changes were happening at the 
appropriate lyric. The rest looks fine to me, and the song plays much more 
accurately now.  Thanks!]

(Verse 1)
Em          B7           Em
God rest ye merry, gentlemen;
Em          C      B7
let nothing you dismay
Em       B7            Em
Remember Christ our Savior
Em          C         B7
was born on Christmas Day
Am          D        G      B7
To save us all from Satan's pow'r
Em                  D/F#
when we were gone a-stray

(Refrain)
  G     C       G     B7       Em
O ti - dings of com - fort and joy,
             D
comfort and joy!
  G     C       G     B7       Em
O ti - dings of com - fort and joy,

(Verse 2)
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

(Verse 3)
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

(Verse 4)
Fear not then said the angel
Let nothing you affright
This day is born a Savior
Of a pure virgin bright
To free all those who trust in Him
From Satan's pow'r and might

(Verse 5)
The shepherds at those tidings
Rejoiced much in mind
And left their flocks afeeding
In tempest storms and wind
And went to Bethlehem straightway
The blessed Babe to find

(Verse 6)
And when they came to Bethlehem
Where our dear Savior lay
They found Him in a manger
Where oxen feed on hay
His mother Mary kneeling down
Unto the Lord did pray

(Verse 7)
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 others doth deface