'Single' in the Bible

Nor shall you make an oath by your head, for you are not able to make a single hair white or black.

and upon finding a single pearl of great value, he went and sold all that he had and bought it.

Seeing a lone fig tree at the roadside, He went to it and found nothing but leaves on it; and He said to it, “Never again will fruit come from you.” And at once the fig tree withered.

“Woe to you, [self-righteous] scribes and Pharisees, hypocrites, because you travel over sea and land to make a single proselyte (convert to Judaism), and when he becomes a convert, you make him twice as much a son of hell as you are.

Jesus said to him, “I assure you and most solemnly say to you, this night, before a rooster crows, you will [completely] deny Me three times.”

And Peter remembered the [prophetic] words of Jesus, when He had said, “Before a rooster crows, you will deny Me three times.” And he went outside and wept bitterly [in repentance].

But Jesus did not reply to him, not even to a single accusation, so that the governor was greatly astonished.