Check the Absolute Maximum Pin voltages in the data sheet.

If you are less than those specified, you are OK.

FPGA device

Has ESD protection.  If absolute maximum voltage (or current) is exceeded, the device may be damaged.

If ESD specification is exceeded, the device may be damaged.

There are no clamps to protect anything greater than absolute maximum, or ESD limits!

Exceed these limits, and you likely destroy the device.