Ἐλευσίς
From LSJ
πάντα χωρεῖ καὶ οὐδὲν μένει καὶ δὶς ἐς τὸν αὐτὸν ποταμὸν οὐκ ἂν ἐμβαίης → all things move and nothing remains still, and you cannot step twice into the same stream
English (LSJ)
ῖνος, ἡ, Eleusis, an old city of Attica, sacred to Demeter and Cora, first in h.Cer.97; late
A Ἐλευσίν Str.9.1.12 codd. (but Ἐλευσίς 9.1.20), Corn.ND28. II Advs. Ἐλευσῖνι at Eleusis, IG12.76.10, al., And.1.111, Lys.6.4, etc.; later ἐν Ἐ. IG22.1028.11, al.: Ἐλευσῖνάδε to Eleusis, Lys.12.52, X.HG2.4.24:Ἐλευσῑνόθεν from Eleusis, And.1.111, Lys.6.45.