'Reliable' in the Bible

But that he has raised him from the dead, no more going to return to decay, he has spoken in this way: 'I will give you the reliable divine decrees of David.'

and we possess [as] more reliable the prophetic word, to which you do well [if you] pay attention to [it] as to a lamp shining in a dark place, until the day dawns and the morning star rises in your hearts,