"Do not keep talking so proudly
or let your mouth speak such arrogance,
for the LORD is a God who knows,
and by him deeds are weighed.

1 Samuel 2:3

When pride comes,
then comes disgrace,
but with humility comes wisdom.

Proverbs 11:2

Pride goes before destruction,
a haughty spirit before a fall.

Proverbs 16:18

Let another praise you, and not your own mouth;
someone else, and not your own lips.

Proverbs 27:2

This is what the LORD says:
"Let not the wise man boast of his wisdom
or the strong man boast of his strength
or the rich man boast of his riches,
but let him who boasts boast about this:
that he understands and knows me,
that I am the LORD, who exercises kindness,
justice and righteousness on earth,
for in these I delight,"  declares the LORD.

Jeremiah 9:23-24

"If anyone wants to be first, he must be the very last,
and the servant of all."

Mark 9:35b

Do not think of yourself more highly than you ought,
but rather think of yourself with sober judgment,
in accordance with the measure of faith God has given you.

Romans 12:3b

But, "Let him who boasts boast in the Lord." 
For it is not the one who commends himself who is approved,
but the one whom the Lord commends.

2 Cor 10:17-18