'Certainly' in the Bible

For most certainly, he doesn't give help to angels, but he gives help to the seed of Abraham.

Now Moses was faithful in [the administration of] all God’s house, [but only] as a ministering servant, [his ministry serving] as a testimony of the things which were to be spoken afterward [the revelation to come in Christ];

I will indeed bless you,and I will greatly multiply you.

how much more certainly shall the blood of Christ, who strengthened by the eternal Spirit offered Himself to God, free from blemish, purify your consciences from lifeless works for you to serve the ever-living God?

For in fact you shared the sufferings of those in prison, and you accepted the confiscation of your belongings with joy, because you knew that you certainly had a better and lasting possession.