Pāṇini sūtras

In the Chhandas, according to some, s is changed to ṣ, when it stands in the beginning of a second word, preceded by a word ending in i &c.

German Nach der Meinung Einiger geht im Veda ein auslautendes s nach einem auf i u. s. w. auslautenden Worte in ṣ über. (106)

1. pūrva+padātपूर्व+पदात्

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   pप्	pūrvaपूर्व	pūrvaपूर्व	antecedent	pūrvaपूर्व
   pप्	padaपद	padātपदात्	word	padपद् + plus ātआत्

Anuvṛtti

1. a+pada+antasyaअ+पद+अन्तस्य 8·3·55

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   aअ	aअ	aअ	not	aअ
   pप्	padaपद	padaपद	word	padपद् + plus aअ
   aअ	antaअन्त	antasyaअन्तस्य	last syllable	antअन्त् + plus asyaअस्य

2. i+ṇ+koḥइ+ण्+कोः 8·3·57

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   iइ	iइ	iइ	ikāraइकार	iइ
   ṇण्	ṇण्	ṇण्	NaNअ	ṇण्
   kक्	kuकु	koḥकोः	guttural	kक् + plus oḥओः

3. ekeṣāmएकेषाम् 8·3·104

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   eए	ekaएक	ekeṣāmएकेषाम्	some(a)	ekaएक + plus ṣष्

4. chandasiछन्दसि 8·3·105

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   cच्	chandasछन्दस्	chandasiछन्दसि	Veda	chandछन्द् + plus asiअसि

5. saḥसः 8·3·56

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   sस्	sस्	saḥसः	sakāraसकार	sस् + plus aḥअः