That is utter nonsense. Many of the earliest Greek philosophers, the presocratics, were well known for having traveled widely beyond the lands of Greece, and it is thought likely that philosophy as such - i.e., the tradition of thinking critically about belief systems - probably emerged in Greece when it did precisely because of their awareness of the sophisticated intellectual traditions of older (but still extant) civilizations, such as those of Egypt and Mesopotamia.
Socrates and Plato may not have taken much interest in non-Greek intellectual traditions (they did not like to read too much anyway), but they lived some two centuries after the time of the early presocratics, and in that period Greek philosophy had advanced to be streets ahead of the older (and, mostly, non-critical) traditions. Despite that, in the next generation Aristotle took a great interest in other cultural traditions, receiving reports about them from the armies of his patron, Alexander, as they rampaged through the lands where the earlier civilized traditions had flourished. He also collected a large personal library, probably the largest library in existence up to that time (setting aside such things as the ‘library’ of Asurbanipal, which was, mostly, really more of an archive of civil service records).
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Whether any of them were aware of The Bible is another matter. At that time, the Hebrews were a small culture, little known and considered of little significance outside of the small area where they lived. It is quite possible their traditions were overlooked by the earlier Greek thinkers who took an interest in such matters. Nevertheless, within a generation or so of Aristotle’s time, the Library of Alexandria (an institution inspired, in many respects, by the Aristotelian tradition of scholarship) was collecting texts of the Hebrew scriptures.
So, Socrates and Plato very likely were not familiar with the Hebrew scriptures, although some of the earlier philosophers who influenced them may have known of the Hebrew traditions. Aristotle may possibly have had some knowledge of them, but he probably would not have regarded them as very important or interesting. Later Greek and Hellenistic philosophers would certainly have had the opportunity to access them, but I know of no evidence that any took any particular interest (unless they were actually Jewish, of course).
To be frank, unless you antecedently take it to be the word of God, there is not very much of philosophical interest in the Old Testament. A lot of it is, at best history and at worst myth and legend, and its ethical theory (which, I hasten to add, is not the ethical theory of either Christianity or modern Judaism) amounts to little more than “follow these rules because God says so.” Greek philosophical ethical theory was already light-years ahead of this by Socrates’ time. Sure, once you have the cultural tradition of thinking that the Bible is a terribly important document, then you can extract all sorts of allegorical meat from it, and put all sorts of interesting philosophical glosses on its contents, but the pre-Christian Greeks had no inkling that it was an important book - it was the myths and legends, and the eccentric laws, of a small, unimportant tribe - and probably found it rather dull and silly for the most part, if they ever bothered to look at it.
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There is no evidence (and, I think, nothing in the Bible to suggest) that Jesus ever read any works of Greek philosophy. However, by the time of the origins of Christianity, the relevant part of the world was saturated with the Greek intellectual tradition, and there is no doubt that ways of thinking pioneered by the classical Greek philosophers (Plato especially) played a large role shaping early (and not-so-early) Christian thought. Jesus himself (who, if not illiterate, was probably educated only in the Jewish scriptures and traditions) may not have been much affected by it, but Paul and the Gospel writers (especially, but not only, John), who all wrote their works in Greek, certainly were, and slightly later Christian theologians, the so called “Church Fathers,” even more so. Whether or not Paul or the Gospel writers had ever actually read any of the works of Plato or other classical Greek philosophers, they certainly felt their influence.