Vow on a Mi Sheberach after an Aliyah in the Synagogue

Received an Aliyah in the synagogue, and a Mi Sheberach was made for him because he would give a gift. Is he obligated in this?

There are several versions of this, and sometimes they are obligatory and sometimes not. See details in the source.

The phrase 'without a vow' in the formula 'Mi Sheberach' during the recitation of Mi Sheberach in the synagogue has several versions: some say 'because he vowed to charity', and then it is not considered a vow since it is in the past tense, but it is considered an intention for charity. Others say 'because he vows to charity' (in the present tense), and then one must be careful to say 'without a vow', because if the gabbai does not say 'without a vow', even if the one called to the Torah thinks it is without a vow, it does not help, as explained in Shut Torah Lishma, Siman 91, that since the shaliach tzibur says the formula of the vow before him and he agrees by saying 'Amen', it is as if he vowed verbally, and what he thinks in his heart does not help. Also, there is a discussion regarding the law of 'a vow through an agent', see Noda B'Yehuda, Part 1, Yoreh Deah 67, and Part 2, Yoreh Deah 147. Also, there is a discussion regarding vows to charity that take effect with intention (see Yoreh Deah 258 and Choshen Mishpat 248). If he clearly thinks in his heart that he does not intend to vow, and the gabbai did not explicitly say 'without a vow', it depends on the aforementioned reasons. (See Orach Chaim, Siman 306, and Arach Shai, Yoreh Deah, Siman 203, and Shut Maharsham, Part 1, in the index, and Part 5, Siman 84).