ἐν ἀρχῇ ἐποίησεν ὁ θεὸς τὸν οὐρανὸν καὶ τὴν γῆν בְּרֵאשִׁית בָּרָא אֱלֹהִים אֵת הַשָּׁמַיִם וְאֵת הָאָרֶץ׃
KeymanWeb is an online keyboard that allows you to type in different alphabets in Unicode. Type your text, copy, and paste into your document. For Greek and Hebrew letters that have "final forms" (σ/ς כ/ך מ/ם נ/ן פ/ף צ/ץ), type the letter using the keyboard displayed and then a space afterwards, and the program will automatically change the letter into its final form.
There are multiple websites that have Greek and Hebrew Unicode texts that you can copy and paste into your document.
Be advised: Often it is best to copy the text into a text file first (in order to strip away any extra code). For Hebrew text, it is better to enter two spaces between the English text you want to copy your text into (e.g., blah blah blah_|_blah). Once you have the two spaces, you can past your Hebrew text into your document between the two spaces.