While I cannot give you a sutra, I can comment on the question. When Buddha says he was a buddha before he started meditating, what he means is his buddha-nature exists here and now. However, before he became enlightened, he had forgotten it. He was not aware of it. The mind created a fog, so that he could not see his buddha-nature. Meditation is the process of clearing the fog, so that you may remember (become conscious of) that which already is.
Sutras
The sutras are part of the three collections of the Buddha's teachings (Vinaya, Sutra and Abhidharma).Sutra refers to discourses that the Buddha gave. The sutras primarily relate to the topic of meditation. The Sanskrit word "sūtra" literally means "something that was heard from someone else".
Buddhists do not worship any deity, not even the Buddha, was was only a man. We do meditation and recite sutras (lessons from the Buddha) in our shrine rooms, or temples.
Worship is a term used in religion to define the relation of the worshipping people towards their god(s). Buddhism has no god(s) so there is no worshipping going on. Buddhists however to revere and respect Buddha for defining the path to enlightenment. As he was simply a man, not a god, this would not be worship.
Buddha said he was not a God, then after he died people wrote sutras. Many contain things that Buddha never ever taught and so because of false teachings, some people began worshipping Buddha, which they were never supposed to do.
The Tripitaka (three baskets) is a set of books that contains the Buddha's teachings. It is comprised of the Sutras, sermons and teachings of Buddha; Abhidharma, discourses on interpretation of the doctrine; and Vinay, rules for monks and nuns in monastic life. So the Tripitaka defines what Buddhism is and how we are to live our lives.
Many Buddhists follow teachings that did not come from Buddha. Some even worship Buddha even though they are not supposed to. So, most Buddhists don't follow anything that Buddha taught, some follow sutras as well as other things that they ought not follow.
The Tripitaka (three baskets) is a set of books that contains the Buddha's teachings. It is comprised of the Sutras, sermons and teachings of Buddha; Abhidharma, discourses on interpretation of the doctrine; and Vinay, rules for monks and nuns in monastic life. So the Tripitaka defines what Buddhism is and how we are to live our lives.
We have three books of the teachings of The Buddha, it is called the Tripitaka, literally "three baskets". The first basket is the Sutras, which are the teachings and sermons of The Buddha. The second is Abhidharma, which are philospical discoures on the teachings. The third is Vinaya, which are the rules for monastic life.
The Tripitaka (three baskets) is a set of books that contains the Buddha's teachings. It is comprised of the Sutras, sermons and teachings of Buddha; Abhidharma, discourses on interpretation of the doctrine; and Vinay, rules for monks and nuns in monastic life. So the Tripitaka defines what Buddhism is and how we are to live our lives.
The Tripitaka (three baskets) is a set of books that contains the Buddha's teachings. It is comprised of the Sutras, sermons and teachings of Buddha; Abhidharma, discourses on interpretation of the doctrine; and Vinay, rules for monks and nuns in monastic life. So the Tripitaka defines what Buddhism is and how we are to live our lives.
The Pali Samyukta Nikaya is the repository for all of the Buddhist sutras. In this collection there are over 2,800 sutras.