<p><span style="font-family: Times New Roman; font-size: medium;">The expansion of e-commerce dramatically changes the spending patterns which are found a significant number of impulse buying. Practical method and easy way to buy specific goods from e-commerce might be an important factor why customers spent their money more impulsively. Researches on this phenomenon showed that psychological values emerged from religiusity condition and self-interest encouragement play as self-regulation for controlling impulsive buying behavior. Viewed from Islamic economic perspective, this study seeks to configurate self-interest (<em>al-nafs</em>) into three levels namely <em>al-nafs al-ammarah</em>, <em>al-nafs al-lawwamah</em>, and <em>al-nafs al-muthmainnah</em> when <em>al-nafs</em> involved in online impulse buying. The first two layers of <em>al-nafs</em> refer to the level of self-interest which are material oriented, whereas the last one represents the highest level of self-interest which is spiritual oriented. By employing 134 repondents from e-commerce customers in Jakarta, the research findings revealed that there was no relationship between religiusity and <em>al-nafs al-ammarah</em> and <em>al-nafs al-lawwamah</em>. However, <em>al-nafs al-ammarah</em> (sig.= 0.000) and <em>al-nafs al-lawwamah</em> (sig.=0.040) positively influenced impulse buying. Meanwhile, there was strong relationship between religiusity and <em>al-nafs al-muthmainnah</em> (sig.= 0.000) in which this highest level of self-interest did not have relationship with impulse buying. These research findings have important implications that in order to regulate impulsive buying behavior, customers should control their self-interest and make it to be <em>al-nafs al-muthmainnah</em>. </span></p><p><span style="font-family: Times New Roman; font-size: medium;"> </span></p><em></em>