After a Negative Particle, in a bahuvrīhi samāsa the acute accent (udātta) falls on the first syllable of 1. jara 2. mara 3. mitra and 4. mṛta,
Thus अज꣡रः, अम꣡रः, अमि꣡त्रः and अमृ꣡तः ॥ Why do we say after a Negative Particle? Observe ब्राह्मणमित्रः ॥ Why do we say \जर &c\. Observe अशत्रुः꣡ when the final gets the acute by 6.2.172.,