Reference: Fataawa at-Talaaq – Question 125, Page 196
Question: What form [of statement] is made when one takes back his wife [after having previously pronounced divorce upon her]?
Response: [Any] word which is indicative of him taking her back is sufficient.
So if he says:
I am taking my wife back
or
I took my wife back
or
I took a hold of my wife
or
I took my wife back under my protection
So all of these words are indicative or the [same] meaning.
[And if he were to say] that which is similar to these words, [in the presence of] two upright witnesses, then this is best; And he says to the two [witnesses]:
I bear witness that I have taken back my wife
or
I took back my wife
or
I took a hold of my wife
or
I took my wife back under my protection
…and similar to these words.