HoldFirst

HoldFirst is an attribute that specifies that the first argument to a function is to be maintained in an unevaluated form.

Examples

Define function with HoldFirst:

SetAttributes[myFunc, HoldFirst];
myFunc[1 + 1, 2 + 2]
(* myFunc[1 + 1, 4] *)

Check attributes:

Attributes[Set]
(* {HoldFirst, Protected, SequenceHold} *)

Please visit the official Wolfram Language Reference for more details.