Religious prohibitions
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Judeo-Christian:

Some Christians and Jews believe Leviticus 19:28 prohibits believers from getting tattoos: Do not make gashes in your skin for the dead. Do not make any marks on your skin. I am God. One reading of Leviticus is to apply it only to the specific ancient practice of rubbing the ashes of the dead into wounds; but modern tattooing is included in other religious interpretations.

Jewish:

Traditional Jews, in strict following of Halakha (Jewish Law), also point to Shulhan Arukh, Yoreh De'ah 180:1, that elucidates the biblical passage above as a prohibition against markings beyond the ancient practice, including tattoos. Maimonides concluded that regardless of intent, the act of tattooing is prohibited (Mishneh Torah, Laws of Idolatry 12:11). Conservative/Masorti Jews point to the next verse of the Shulhan Arukh (Yoreh De'ah 180:2), "If it [the tattoo] was done in the flesh of another, the one to whom it was done is blameless" – this is used by they to say that tattooing yourself is different from obtaining a tattoo, and that the latter may be acceptable. Traditional Jews interpret this as only forcible tattooing, as was the case during the Holocaust. Surgery and tattoos needed for surgery (eg: to mark the lines of an excision) are permitted by the next line (180:3). According to the major Jewish denominations, having a tattoo does not prohibit participation, and one may be buried in a Jewish cemetery and participate fully in all synagogue ritual. In stricter, more traditional approaches, though, a community may have a psak (ruling or responsa with the weight of Halakha) that may counter one's acceptance in regards to burial. Many of these communities, most notably the Modern Orthodox, accept laser removal of the tattoo as teshuvah (repentence), even if removed post-mortem (see Tahara).

Islamic:

Following the Sharia (or Islamic Law), the majority of Muslims hold that tattooing is religiously forbidden (along with most other forms of 'permanent' physical modification). This view arises from Qur'anic verses and explicit references in the Prophetic Hadith which denounce those who attempt to change the creation of Allah, in what is seen as excessive attempts to beautify that which was already perfected. The human being is seen as having been ennobled by Allah, the human form viewed as created beautiful, such that the act of tattooing would be a form of self-mutilation.[2] [3] Some Muslims believe that though tattooing is not haraam (prohibited), it is nonetheless makruh (disdained). Muslims who received tattoos prior to conversion to Islam, however, face no special obstacle to religious observance. Henna patterns, however, are used among Muslim women, as distinguished from permanent tattooing.