Where to access the_content()

i am trying to find out the variable name used in the_content(), due to which image is displayed in the post.

I need to know what varible in the the_content() was responsible for storing the image link (<img src” “> tag) which then gets displayed in our post.

for reference purpose following output is shown.
As seen from browser The ouput of the_content() is as under–

<div class="entry-content-single">
			<div class="singleads">
			</div>
			<h3><a href="https://www.amazon.com/Nike-Zoom-Edition-Skate-Shoes/dp/B0DFGXY%3FSubscriptionId%3FGTYHTKB47OFA%26tag%3Dfrgbgrdtg0-20%26linkCode%3Dxm2%26camp%3D4545%26creative%3D165953%26creativeASIN%3DB00BX15IXY" rel="nofollow">Nike Zoom Team Edition Skate Shoes Blue Mens</a></h3>
<p><a href="https://www.amazon.com/Nike-Zoom-Edition-Skate-Shoes/dp/B00BX15IXY%3FSubscriptionId%3DWSEDRFFA%26tag%3Dfroplufordo00-20%26linkCode%3Dxm2%26camp%3D345%26creative%3D1543%26creativeASIN%3DB00BX15IXY" rel="nofollow"><img style="float:left;margin: 0 20px 10px 0;"
<strong>src="https://ecx.images-amazon.com/images/I/416EoTC-8GL._SL160_.jpg" </strong>

alt="Nike Zoom Team Edition Skate Shoes Blue Mens" /></a></p>
<ul>
<li>This shoes / sandals / boots style name or model number is Zoom Team Edition</li>
<li>Color: Atlantic Blue/Tangier Orange</li>
<li>Material: Nubuck Upper and Rubber Outsole</li>
<li>Measurements: 1″ heel</li>
<li>Width: D</li>
</ul>
<p>The Nike Zoom Team Edition shoes feature a nubuck upper with a round toe. The rubber outsole lends lasting traction and wear.</p>
<p><div style="float:right;"><a href="https://www.amazon.com/Nike-Zoom-Edition-Skate-Shoes/dp/B00BX15IXY%3FSubscriptionId%3DAKIASCFVFVF47OFA%26tag%3Dfrfvfdordfd-20%26linkCode%3Dxm2%26camp%3D235%26creative%3D16543%26creativeASIN%3DB00BX15IXY" rel="nofollow"><img src="https://step-games.com/am1/wp-content/plugins/WPRobot3/images/buynow-big.gif" /></a></div>
<p>List Price: $  70.00</p>
<p><strong>Price: $  70.00</strong></p>