What historical evidence exists for the practice and teaching of contemplative prayer by the apostles and/or the early Church?

Building on the previous question regarding scriptural support (https://christianity.stackexchange.com/q/108086/117426) , I'm now seeking historical evidence pertaining to the practice and instruction of contemplative prayer by the apostles or the early Church (i.e., the first two centuries). For a definition of contemplative prayer, please refer to the aforementioned linked question.