John Gill Commentary Nehemiah 6:2

"that Sanballat and Geshem sent unto me, saying, Come, let us meet together in [one of] the villages in the plain of Ono. But they thought to do me mischief." — Nehemiah 6:2 (ASV)

Then Sanballat and Geshem sent unto me
Messengers:

saying, come, let us meet together in some one of the villages ;
in Cephirim, which Jarchi takes to be the name of a place, perhaps the same with Cephirah, a city in the tribe of Benjamin, (Joshua 18:26)

in the plain of Ono ;
which was in the same tribe, see (1 Chronicles 8:12) , they might pretend a friendly meeting, to accommodate differences between them, or to converse together about the general interest of the king of Persia in those parts:

but they thought to do me mischief ;
to kill him, or at least to confine him; this he either conjectured from their general character and behaviour, or he had intelligence of their design.