Tex. Elec. Code § 64.034
A person, other than an election officer, selected to provide assistance to a voter must take the following oath, administered by an election officer at the polling place, before providing assistance:
"I swear (or affirm) under penalty of perjury that the voter I am assisting represented to me they are eligible to receive assistance; I will not suggest, by word, sign, or gesture, how the voter should vote; I will confine my assistance to reading the ballot to the voter, directing the voter to read the ballot, marking the voter's ballot, or directing the voter to mark the ballot; I will prepare the voter's ballot as the voter directs; I did not pressure or coerce the voter into choosing me to provide assistance; I am not the voter's employer, an agent of the voter's employer, or an officer or agent of a labor union to which the voter belongs; I will not communicate information about how the voter has voted to another person; and I understand that if assistance is provided to a voter who is not eligible for assistance, the voter's ballot may not be counted."
Tex. Elec. Code § 64.034