Texas Estates Code - EST § 51.101. Requirements for Return on Citation or Notice Served by Personal Service

(1) be endorsed on or attached to the citation or notice;

(2) state the date and place of service;

(3) certify that a copy of the citation or notice was delivered to the person directed to be served;

(4) be subscribed and sworn to before, and under the hand and official seal of, an officer authorized by the laws of this state to take an affidavit;  and

(5) be returned to the county clerk who issued the citation or notice.