They were looking for testimony (Mk 14:55-14:55)

“Now the chief priests

And the whole council

Were looking

For testimony

Against Jesus

To put him

To death.

However,

They found none.”

 

Οἱ δὲ ἀρχιερεῖς καὶ ὅλον τὸ συνέδριον ἐζήτουν κατὰ τοῦ Ἰησοῦ μαρτυρίαν εἰς τὸ θανατῶσαι αὐτόν, καὶ οὐχ ηὕρισκον·

 

This is almost word for word in Matthew, chapter 26:59-60.  However, this looking for testimony was not in Luke, chapter 22, and John, chapter 18.  Mark said that the chief priests (Οἱ δὲ ἀρχιερεῖς) with the whole council (καὶ ὅλον τὸ συνέδριον) sought false testimony against Jesus (ἐζήτουν κατὰ τοῦ Ἰησοῦ).  They did this, so that they might put him to death (εἰς τὸ θανατῶσαι αὐτόν).  However, they could not find any witnesses (καὶ οὐχ ηὕρισκον).