user5213: I would like to research this method in historical texts, but any search on google for ‘body scan’ only returns results related to the modern vipassana movement. 

user631: "Kayanupassana" comming under "Chathu Satipatthana". You can find detailed discription in "Maha Satipatthana Sutta"
Also refer and search for "Anapanasati Meditation".
Refer:http://www.accesstoinsight.org/tipitaka/mn/mn.118.than.html

user6999: Kayagata-sati Sutta.  Buddha was explicit that breathing is part of the body, so anapanasati is a sub-set of body scanning.  

5213: <p>I would like to research this method in historical texts, but any search on google for ‘body scan’ only returns results related to the modern vipassana movement. </p>
 631: <p>"Kayanupassana" comming under "Chathu Satipatthana". You can find detailed discription in <a href="http://www.accesstoinsight.org/tipitaka/dn/dn.22.0.than.html" rel="nofollow">"Maha Satipatthana Sutta"</a></p>

<p>Also refer and search for "Anapanasati Meditation".</p>

<p>Refer:<a href="http://www.accesstoinsight.org/tipitaka/mn/mn.118.than.html" rel="nofollow">http://www.accesstoinsight.org/tipitaka/mn/mn.118.than.html</a></p>
 6999: <p><a href="http://www.accesstoinsight.org/tipitaka/mn/mn.119.than.html" rel="nofollow">Kayagata-sati Sutta</a>.  Buddha was explicit that breathing is part of the body, so anapanasati is a sub-set of body scanning.  </p>
