Nimitta - sutta references

Please provide references from the Pali suttas on nimitta. Are they mentioned in the context of jhana? In the article below, it is mentioned that nimitta is found in the Anapanasati Sutta , but I couldn't find it. Is it there? In the article "Stepping Towards Enlightenment ", Ajahn Brahm wrote about nimitta: > THE NINTH STEP OF the *Anapanasati Sutta* describes a very important > creature that comes to visit the still, silent mind—a *nimitta*. Pali > for “sign,” a *nimitta* is a reflection of the mind. This step is called > *citta-patisamvedi*, “experiencing the mind,” and is achieved when one > lets go of the body, thought, and the five senses (including awareness > of the breath) so completely that only a beautiful mental sign, a > *nimitta*, remains. This pure mental object is a real object in the > landscape of the mind, and when it appears for the first time it is > extremely strange. For most meditators this mental joy, is perceived > as a beautiful light. But it is not a light. The eyes are closed, and > the sight consciousness has long been turned off. Other meditators > choose to describe this first appearance of mind in terms of a > physical sensation such as intense tranquility or ecstasy. It is > perceived as a light or a feeling because this imperfect description > is the best that perception can offer.