12th Apostle Paul or Matthias?

Jesus had picked 12 apostles and Judas hung himself. There were then only 11 apostles.
John 6:70 Jesus answered them, Have not I chosen you twelve, and one of you is a devil?

I fail to find in scripture where the Lord told the apostles to choose a replacement for Judas as recorded here. They did this act on their own accord with out being told to do this.

Acts Chapter 1:24 And they prayed, and said, Thou, Lord, which knowest the hearts of all [men], shew whether of these two thou hast chosen,

25 That he may take part of this ministry and apostleship, from which Judas by transgression fell, that he might go to his own place.

26 And they gave forth their lots; and the lot fell upon Matthias; and he was numbered with the eleven apostles.

I am sure both of these men were faithful in the eyes of the 11, but still the Lord did not command them to do this thing. Saul / Paul however was a different story.