The Text Box control does not have a record source property.  Forms and
Reports have record source properties.  What you have for a Text Box is a
control source property; however, since a text box holds only one specific
data item, a query may not be the best way to accomplish this.  It may be
that a DLookup would provide you what you need.  Be aware that if the control
source is not a field in the form's record source, the text box will not be
updateable.

A Text control does not have a record source property.
It does have a control source property.

If you let us know what you are trying to accomplish, perhaps someone
can help you.