Psalm 22.22
Septuagint

dihghsomai to onoma sou toiV adelfoiV mou, 
en mesw ekklhsiaV  umnhsw se

New Testament - Hebrews 2.12

apaggelw to onoma sou toiV adelfoiV mou, 
en mesw ekklhsiaV umnhsw  se

Septuagint

I will declare thy name to my brethren:  in the midst of the church will I sing praise to thee

New Testament

I will declare thy name unto my brethren, In the midst of the congregation will I sing thy praise

Masoretic Text

I will declare thy name unto my brethren:  In the midst of the assembly will I praise thee

Comments:  The NT and the LXX agree.  The MT does not include the notion of singing praise.