The earliest reference I am aware of is Periyazhwaar’s “தீயிற் பொழிகின்ற செஞ்சுடராழி * திகழ் திருச்சக்கரத்தின் *
கோயிற் பொறியாேல ஒற்றுண்டு நின்று * குடிகுடி ஆட்செய்கின்றோம் “

அடியேன் தாசன்

Namaskaram Swamy,
From our Swamigal’s pravachanams, the Panjasamskram procedure was initiated by our poorvaachariyars , long ago even much before to “Udayavar”. 
Kambandasanswamy:  Devareer’s explanation/reference is incorrect. The real meaning for this Thiruppalaandu pasurams is: 

Shamikkanum,

Adiyean Ramanujadhasan

Sorry… for the typo error (auto fill)>> pls. read as below….
Kambandasanswamy:  Devareer’s explanation/reference is correct. The real meaning for this Thiruppalaandu pasurams is: 

Adiyean,

hahahaaa! I think it is better they call “auto correct” as “auto incorrect”!

Thank you for sharing the text reference Srinivasan swamy. I had shared based on what I had heard from our Swamy’s upanyasam. I did not know this text reference.

adiyen dasan.

Srimate Ramanujaye Namaha!

Srinivasan swamy and KAmbandasan swamy, i have a clarification in the above text. Is the paasuram literally referring to Pancha samskaram, or indireclty as Panchasamskram involves sangu mark also?

Dhanyosmi

Adiyen

I think it is also anaadhi like bhagavan

Namaskaram.

I checked up and got this reference for my query.

https://www.quora.com/What-is-the-significance-behind-doing-Samasrayanam

I do not know about the correctness of the details mentioned there.

adiyen

Please listen to the following enpani audios of our Swami reg. Pancha Samaskaram and high-level doubts about Saranagathi. 

168, 734, 904, 911, 1135, 1740, 1795, 1800

Adiyen,
Ramanuja Dasan