Manusmriti
अदर्शयित्वा तत्रैव हिरण्यं परिवर्तयेत् । यावती सम्भवेद् वृद्धिस्तावतीं दातुमर्हति ॥ १५५ ॥
If he cannot pay the money (due as interest), he may insert it in the renewed (agreement); he must pay as much interest as may be due.
english translation
adarzayitvA tatraiva hiraNyaM parivartayet । yAvatI sambhaved vRddhistAvatIM dAtumarhati ॥ 155 ॥
hk transliteration by Sanscript