Matthew 22:34

Οἱ δὲ Φαρισαῖοι, ἀκούσαντες ὅτι ἐφίμωσε τοὺς Σαδδουκαίους, συνήχθησαν ἐπὶ τὸ αὐτό.

RBT Greek Interlinear:

Strongs 3588; Hoi; Οἱ; the; Art-NMP

Strongs 1161; de; δὲ; and; Conj

Strongs 5330; Pharisaioi; Φαρισαῖοι; Separatists; N-NMP

Strongs 191; akousantes; ἀκούσαντες; those who have heard; V-APA-NMP

Strongs 3754; hoti; ὅτι; that; Conj

Strongs 5392; ephimōsen; ἐφίμωσεν; He had silenced; V-AIA-3S

Strongs 3588; tous; τοὺς; the; Art-AMP

Strongs 4523; Saddoukaious; Σαδδουκαίους; Sadducees; N-AMP

Strongs 4863; synēchthēsan; συνήχθησαν; were led together; V-AIP-3P

Strongs 1909; epi; ἐπὶ; upon; Prep

Strongs 3588; to; τὸ; the; Art-ANS

Strongs 846; auto; αὐτό; self; PPro-AN3S

RBT Hebrew Literal:

τὸ αὐτό - The Self

And the Separatists, those who have heard that he had muzzled the Purists ("Sadducees"), were led together upon the Self.⁴³

Julia Smith Literal 1876 Translation:
And the Pharisees having heard that he muzzled the Sadducees, were gathered upon the same.

LITV Translation:
But hearing that He had silenced the Sadducees, the Pharisees were gathered together.

ESV Translation:
But when the Pharisees heard that he had silenced the Sadducees, they gathered together.

Footnotes

43

Almost all translations drop this phrase. τὸ αὐτό the self.

A few literal ones make a rather sandy attempt to include it:

"gathered together the same" - Berean Literal Bible

"gathered upon the same" - Smith's Literal Translation

"gathered unto Him" - Young's Literal Translation 

"gathered together upon the same" - Literal Emphasis Translation