Significant effort is given in the Talmud to address the property rights of slaves. While the Torah only refers to a slave's specific ability to collect gleanings, Talmudic sources interpret this commandment to include the right to own property more generally, and even "purchase" a portion of their own labor from the master. Hezser notes the often confusing mosaic of Talmudic laws distinguishes between finding property during work and earning property as a result of work. While the Talmud affirmed that self-redemption of slaves (Jewish or not) was always permitted, it noted that conditionless manumission by the owner was generally a violation of legal precept. The Talmud however, also included a varied list of circumstances and conditions that overrode this principle and mandated manumission. Conditions such as ill-treatment, oral promise, marriage to a free-woman, escape, inclusion in religious ceremony, and desire to visit the Holy Land all required the master to provide the slave with a deed of manumission, presented to him with witnesses. Failure to comply would result in excommunication.