כל המקיים נפש אחת מישראל
מעלה עליו הכתוב
כאילו קיים עולם מלא

סנהדרין ל"ז א’

Entin Square is at the entrance gate to the Tel Aviv University campus in Ramat Aviv.

The square is studded with cobblestones with quotes, sayings, illustrations or formulas of the great scientists, thinkers and writers.

In the next photo taken that day you can see the square and the way the tiles are laid Click for a larger image

Details about the square can be found here Click for sign's details

The current quote is from the Sanhedrin tractate, and appears only in the Hebrew language (in two different fonts). The treatise is in the Nezikin order out of the Mishnah. The full sentence is: Therefore, a single person was created in the world, to teach that anyone who loses one soul, is exalted over him as if he had lost an entire world; And everyone who sustains one soul is exalted over him as if a whole world existed (Version without mention of Israel)
Rambam gave it a more universal validity in his quote "Whoever sustains one soul in the world"

Translation of the text on the sign:
Anyone who sustains one soul from Israel
The Scripture indicates
As if there were a whole world

Sanhedrin 37a